Test issues with Python 3.9

[hroncok]

Hello. In Fedora development version, we have recently updated to Python 3.9.0b1. Here are some test failures we get w/astunparse:

$ tox -e py39
py39 develop-inst-noop: .../astunparse
py39 installed: -e git://github.com/simonpercivall/astunparse.git@2acce01fcdda2ea32eea835c30ccca21aaff7297#egg=astunparse,coverage==3.7.1,six==1.15.0
py39 run-test-pre: PYTHONHASHSEED='209768785'
py39 run-test: commands[0] | .../astunparse/.tox/py39/bin/python setup.py test
running test
WARNING: Testing via this command is deprecated and will be removed in a future version. Users looking for a generic test entry point independent of test runner are encouraged to use tox.
running egg_info
writing lib/astunparse.egg-info/PKG-INFO
writing dependency_links to lib/astunparse.egg-info/dependency_links.txt
writing requirements to lib/astunparse.egg-info/requires.txt
writing top-level names to lib/astunparse.egg-info/top_level.txt
reading manifest file 'lib/astunparse.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'lib/astunparse.egg-info/SOURCES.txt'
running build_ext
test_annotations (tests.test_unparse.UnparseTestCase) ... ok
test_async_comp_and_gen_in_async_function (tests.test_unparse.UnparseTestCase) ... ok
test_async_comprehension (tests.test_unparse.UnparseTestCase) ... ok
test_async_for (tests.test_unparse.UnparseTestCase) ... ok
test_async_function_def (tests.test_unparse.UnparseTestCase) ... ok
test_async_generator_expression (tests.test_unparse.UnparseTestCase) ... ok
test_async_with (tests.test_unparse.UnparseTestCase) ... ok
test_async_with_as (tests.test_unparse.UnparseTestCase) ... ok
test_bytes (tests.test_unparse.UnparseTestCase) ... ok
test_chained_comparisons (tests.test_unparse.UnparseTestCase) ... ok
test_class_decorators (tests.test_unparse.UnparseTestCase) ... ok
test_class_definition (tests.test_unparse.UnparseTestCase) ... ok
test_complex_f_string (tests.test_unparse.UnparseTestCase) ... ok
test_del_statement (tests.test_unparse.UnparseTestCase) ... ok
test_dict_comprehension (tests.test_unparse.UnparseTestCase) ... ok
test_dict_with_unpacking (tests.test_unparse.UnparseTestCase) ... ok
test_elifs (tests.test_unparse.UnparseTestCase) ... ok
test_files (tests.test_unparse.UnparseTestCase) ... ok
test_for_else (tests.test_unparse.UnparseTestCase) ... ok
test_formatted_value (tests.test_unparse.UnparseTestCase) ... ok
test_function_arguments (tests.test_unparse.UnparseTestCase) ... ok
test_huge_float (tests.test_unparse.UnparseTestCase) ... ok
test_imaginary_literals (tests.test_unparse.UnparseTestCase) ... ok
test_import_many (tests.test_unparse.UnparseTestCase) ... ok
test_integer_parens (tests.test_unparse.UnparseTestCase) ... skipped 'Only works for Python < 3.6'
test_joined_str (tests.test_unparse.UnparseTestCase) ... ok
test_joined_str_361 (tests.test_unparse.UnparseTestCase) ... skipped 'Only supported on 3.6.0'
test_lambda_parentheses (tests.test_unparse.UnparseTestCase) ... ok
test_min_int27 (tests.test_unparse.UnparseTestCase) ... skipped 'Only works for Python 2'
test_min_int30 (tests.test_unparse.UnparseTestCase) ... ok
test_negative_zero (tests.test_unparse.UnparseTestCase) ... ok
test_nonlocal (tests.test_unparse.UnparseTestCase) ... ok
test_parser_modes (tests.test_unparse.UnparseTestCase) ... ok
test_raise_from (tests.test_unparse.UnparseTestCase) ... ok
test_relative_import (tests.test_unparse.UnparseTestCase) ... ok
test_repr (tests.test_unparse.UnparseTestCase) ... skipped 'Only for Python 2'
test_set_comprehension (tests.test_unparse.UnparseTestCase) ... ok
test_set_literal (tests.test_unparse.UnparseTestCase) ... ok
test_shifts (tests.test_unparse.UnparseTestCase) ... ok
test_starred_assignment (tests.test_unparse.UnparseTestCase) ... ok
test_try_except_finally (tests.test_unparse.UnparseTestCase) ... ok
test_unary_parens (tests.test_unparse.UnparseTestCase) ... ok
test_variable_annotation (tests.test_unparse.UnparseTestCase) ... ok
test_while_else (tests.test_unparse.UnparseTestCase) ... ok
test_with_as (tests.test_unparse.UnparseTestCase) ... ok
test_with_simple (tests.test_unparse.UnparseTestCase) ... ok
test_with_two_items (tests.test_unparse.UnparseTestCase) ... ok
test_annotations (tests.test_dump.DumpTestCase) ... FAIL
test_async_comp_and_gen_in_async_function (tests.test_dump.DumpTestCase) ... FAIL
test_async_comprehension (tests.test_dump.DumpTestCase) ... FAIL
test_async_for (tests.test_dump.DumpTestCase) ... FAIL
test_async_function_def (tests.test_dump.DumpTestCase) ... FAIL
test_async_generator_expression (tests.test_dump.DumpTestCase) ... FAIL
test_async_with (tests.test_dump.DumpTestCase) ... FAIL
test_async_with_as (tests.test_dump.DumpTestCase) ... FAIL
test_bytes (tests.test_dump.DumpTestCase) ... FAIL
test_chained_comparisons (tests.test_dump.DumpTestCase) ... FAIL
test_class_decorators (tests.test_dump.DumpTestCase) ... ok
test_class_definition (tests.test_dump.DumpTestCase) ... FAIL
test_complex_f_string (tests.test_dump.DumpTestCase) ... FAIL
test_del_statement (tests.test_dump.DumpTestCase) ... ok
test_dict_comprehension (tests.test_dump.DumpTestCase) ... FAIL
test_dict_with_unpacking (tests.test_dump.DumpTestCase) ... ok
test_elifs (tests.test_dump.DumpTestCase) ... ok
test_files (tests.test_dump.DumpTestCase) ... ok
test_for_else (tests.test_dump.DumpTestCase) ... FAIL
test_formatted_value (tests.test_dump.DumpTestCase) ... FAIL
test_function_arguments (tests.test_dump.DumpTestCase) ... FAIL
test_huge_float (tests.test_dump.DumpTestCase) ... FAIL
test_imaginary_literals (tests.test_dump.DumpTestCase) ... FAIL
test_import_many (tests.test_dump.DumpTestCase) ... FAIL
test_integer_parens (tests.test_dump.DumpTestCase) ... skipped 'Only works for Python < 3.6'
test_joined_str (tests.test_dump.DumpTestCase) ... FAIL
test_joined_str_361 (tests.test_dump.DumpTestCase) ... skipped 'Only supported on 3.6.0'
test_lambda_parentheses (tests.test_dump.DumpTestCase) ... FAIL
test_min_int27 (tests.test_dump.DumpTestCase) ... skipped 'Only works for Python 2'
test_min_int30 (tests.test_dump.DumpTestCase) ... FAIL
test_negative_zero (tests.test_dump.DumpTestCase) ... FAIL
test_nonlocal (tests.test_dump.DumpTestCase) ... FAIL
test_parser_modes (tests.test_dump.DumpTestCase) ... ok
test_raise_from (tests.test_dump.DumpTestCase) ... FAIL
test_relative_import (tests.test_dump.DumpTestCase) ... FAIL
test_repr (tests.test_dump.DumpTestCase) ... skipped 'Only for Python 2'
test_set_comprehension (tests.test_dump.DumpTestCase) ... FAIL
test_set_literal (tests.test_dump.DumpTestCase) ... FAIL
test_shifts (tests.test_dump.DumpTestCase) ... FAIL
test_starred_assignment (tests.test_dump.DumpTestCase) ... FAIL
test_try_except_finally (tests.test_dump.DumpTestCase) ... FAIL
test_unary_parens (tests.test_dump.DumpTestCase) ... FAIL
test_variable_annotation (tests.test_dump.DumpTestCase) ... FAIL
test_while_else (tests.test_dump.DumpTestCase) ... FAIL
test_with_as (tests.test_dump.DumpTestCase) ... FAIL
test_with_simple (tests.test_dump.DumpTestCase) ... FAIL
test_with_two_items (tests.test_dump.DumpTestCase) ... FAIL

======================================================================
FAIL: test_annotations (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 331, in test_annotations
    self.check_roundtrip("def f(a : int): pass")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[113 chars]ad()), type_comment=None)], vararg=None, kwonl[133 chars]=[])" != "Modu[113 chars]ad()))], kwonlyargs=[], kw_defaults=[], defaul[56 chars]=[])"
Diff is 1031 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_async_comp_and_gen_in_async_function (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 356, in test_async_comp_and_gen_in_async_function
    self.check_roundtrip(async_comprehensions_and_generators)
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[84 chars]=[], vararg=None, kwonlyargs=[], kw_defaults=[[1944 chars]=[])" != "Modu[84 chars]=[], kwonlyargs=[], kw_defaults=[], defaults=[[1725 chars]=[])"
Diff is 3952 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_async_comprehension (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 360, in test_async_comprehension
    self.check_roundtrip("{i async for i in aiter() if i % 2}")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[247 chars]stant(value=2, kind=None))], is_async=1)]))], type_ignores=[])" != "Modu[247 chars]stant(value=2))], is_async=1)]))], type_ignores=[])"
Diff is 1175 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_async_for (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 418, in test_async_for
    self.check_roundtrip(async_for)
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[71 chars]=[], vararg=None, kwonlyargs=[], kw_defaults=[[262 chars]=[])" != "Modu[71 chars]=[], kwonlyargs=[], kw_defaults=[], defaults=[[185 chars]=[])"
Diff is 704 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_async_function_def (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 414, in test_async_function_def
    self.check_roundtrip(async_function_def)
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[71 chars]=[], vararg=None, kwonlyargs=[], kw_defaults=[[145 chars]=[])" != "Modu[71 chars]=[], kwonlyargs=[], kw_defaults=[], defaults=[[87 chars]=[])"
Diff is 949 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_async_generator_expression (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 366, in test_async_generator_expression
    self.check_roundtrip("(i ** 2 async for i in agen())")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[101 chars]lue=2, kind=None)), generators=[comprehension([138 chars]=[])" != "Modu[101 chars]lue=2)), generators=[comprehension(target=Name[127 chars]=[])"
- Module(body=[Expr(value=GeneratorExp(elt=BinOp(left=Name(id='i', ctx=Load()), op=Pow(), right=Constant(value=2, kind=None)), generators=[comprehension(target=Name(id='i', ctx=Store()), iter=Call(func=Name(id='agen', ctx=Load()), args=[], keywords=[]), ifs=[], is_async=1)]))], type_ignores=[])
+ Module(body=[Expr(value=GeneratorExp(elt=BinOp(left=Name(id='i', ctx=Load()), op=Pow(), right=Constant(value=2)), generators=[comprehension(target=Name(id='i', ctx=Store()), iter=Call(func=Name(id='agen', ctx=Load()), args=[], keywords=[]), ifs=[], is_async=1)]))], type_ignores=[])


======================================================================
FAIL: test_async_with (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 422, in test_async_with
    self.check_roundtrip(async_with)
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[71 chars]=[], vararg=None, kwonlyargs=[], kw_defaults=[[292 chars]=[])" != "Modu[71 chars]=[], kwonlyargs=[], kw_defaults=[], defaults=[[195 chars]=[])"
Diff is 744 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_async_with_as (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 426, in test_async_with_as
    self.check_roundtrip(async_with_as)
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[71 chars]=[], vararg=None, kwonlyargs=[], kw_defaults=[[313 chars]=[])" != "Modu[71 chars]=[], kwonlyargs=[], kw_defaults=[], defaults=[[236 chars]=[])"
Diff is 806 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_bytes (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 294, in test_bytes
    self.check_roundtrip("b'123'")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Module(body=[Expr(value=Constant(value=b'123', kind=None))], type_ignores=[])" != "Module(body=[Expr(value=Constant(value=b'123'))], type_ignores=[])"
- Module(body=[Expr(value=Constant(value=b'123', kind=None))], type_ignores=[])
?                                              -----------
+ Module(body=[Expr(value=Constant(value=b'123'))], type_ignores=[])


======================================================================
FAIL: test_chained_comparisons (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 261, in test_chained_comparisons
    self.check_roundtrip("1 < 4 <= 5")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: 'Modu[44 chars]lue=1, kind=None), ops=[Lt(), LtE()], comparat[81 chars]=[])' != 'Modu[44 chars]lue=1), ops=[Lt(), LtE()], comparators=[Consta[48 chars]=[])'
- Module(body=[Expr(value=Compare(left=Constant(value=1, kind=None), ops=[Lt(), LtE()], comparators=[Constant(value=4, kind=None), Constant(value=5, kind=None)]))], type_ignores=[])
?                                                      -----------                                                   -----------                   -----------
+ Module(body=[Expr(value=Compare(left=Constant(value=1), ops=[Lt(), LtE()], comparators=[Constant(value=4), Constant(value=5)]))], type_ignores=[])


======================================================================
FAIL: test_class_definition (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 374, in test_class_definition
    self.check_roundtrip("class A(metaclass=type, *[], **{}): pass")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[164 chars]word(arg=None, value=Dict(keys=[], values=[]))[51 chars]=[])" != "Modu[164 chars]word(value=Dict(keys=[], values=[]))], body=[P[41 chars]=[])"
Diff is 721 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_complex_f_string (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 327, in test_complex_f_string
    self.check_roundtrip(complex_f_string)
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[51 chars]e='-', kind=None), FormattedValue(value=Joined[519 chars]=[])" != "Modu[51 chars]e='-'), FormattedValue(value=JoinedStr(values=[359 chars]=[])"
Diff is 1095 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_dict_comprehension (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 347, in test_dict_comprehension
    self.check_roundtrip("{x: x*x for x in range(10)}")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[269 chars]ue=10, kind=None)], keywords=[]), ifs=[], is_a[25 chars]=[])" != "Modu[269 chars]ue=10)], keywords=[]), ifs=[], is_async=0)]))][14 chars]=[])"
Diff is 1273 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_for_else (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 206, in test_for_else
    self.check_roundtrip(for_else)
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[66 chars]=[], vararg=None, kwonlyargs=[], kw_defaults=[[482 chars]=[])" != "Modu[66 chars]=[], kwonlyargs=[], kw_defaults=[], defaults=[[334 chars]=[])"
Diff is 1063 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_formatted_value (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 298, in test_formatted_value
    self.check_roundtrip('f"{value}"')
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[81 chars]oad()), conversion=-1, format_spec=None)]))], type_ignores=[])" != "Modu[81 chars]oad()), conversion=-1)]))], type_ignores=[])"
- Module(body=[Expr(value=JoinedStr(values=[FormattedValue(value=Name(id='value', ctx=Load()), conversion=-1, format_spec=None)]))], type_ignores=[])
?                                                                                                           ------------------
+ Module(body=[Expr(value=JoinedStr(values=[FormattedValue(value=Name(id='value', ctx=Load()), conversion=-1)]))], type_ignores=[])


======================================================================
FAIL: test_function_arguments (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 265, in test_function_arguments
    self.check_roundtrip("def f(): pass")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[66 chars]=[], vararg=None, kwonlyargs=[], kw_defaults=[[110 chars]=[])" != "Modu[66 chars]=[], kwonlyargs=[], kw_defaults=[], defaults=[[52 chars]=[])"
- Module(body=[FunctionDef(name='f', args=arguments(posonlyargs=[], args=[], vararg=None, kwonlyargs=[], kw_defaults=[], kwarg=None, defaults=[]), body=[Pass()], decorator_list=[], returns=None, type_comment=None)], type_ignores=[])
?                                                                           -------------                                ------------                                              ---------------------------------
+ Module(body=[FunctionDef(name='f', args=arguments(posonlyargs=[], args=[], kwonlyargs=[], kw_defaults=[], defaults=[]), body=[Pass()], decorator_list=[])], type_ignores=[])


======================================================================
FAIL: test_huge_float (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 223, in test_huge_float
    self.check_roundtrip("1e1000")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: 'Module(body=[Expr(value=Constant(value=inf, kind=None))], type_ignores=[])' != 'Module(body=[Expr(value=Constant(value=inf))], type_ignores=[])'
- Module(body=[Expr(value=Constant(value=inf, kind=None))], type_ignores=[])
?                                           -----------
+ Module(body=[Expr(value=Constant(value=inf))], type_ignores=[])


======================================================================
FAIL: test_imaginary_literals (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 239, in test_imaginary_literals
    self.check_roundtrip("7j")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: 'Module(body=[Expr(value=Constant(value=7j, kind=None))], type_ignores=[])' != 'Module(body=[Expr(value=Constant(value=7j))], type_ignores=[])'
- Module(body=[Expr(value=Constant(value=7j, kind=None))], type_ignores=[])
?                                          -----------
+ Module(body=[Expr(value=Constant(value=7j))], type_ignores=[])


======================================================================
FAIL: test_import_many (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 283, in test_import_many
    self.check_roundtrip(import_many)
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[35 chars]fred', asname=None), alias(name='barney', asna[25 chars]=[])" != "Modu[35 chars]fred'), alias(name='barney')])], type_ignores=[])"
- Module(body=[Import(names=[alias(name='fred', asname=None), alias(name='barney', asname=None)])], type_ignores=[])
?                                             -------------                      -------------
+ Module(body=[Import(names=[alias(name='fred'), alias(name='barney')])], type_ignores=[])


======================================================================
FAIL: test_joined_str (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 305, in test_joined_str
    self.check_roundtrip('f"{key}={value!s}"')
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[95 chars]on=-1, format_spec=None), Constant(value='=', [114 chars]=[])" != "Modu[95 chars]on=-1), Constant(value='='), FormattedValue(va[67 chars]=[])"
- Module(body=[Expr(value=JoinedStr(values=[FormattedValue(value=Name(id='key', ctx=Load()), conversion=-1, format_spec=None), Constant(value='=', kind=None), FormattedValue(value=Name(id='value', ctx=Load()), conversion=115, format_spec=None)]))], type_ignores=[])
+ Module(body=[Expr(value=JoinedStr(values=[FormattedValue(value=Name(id='key', ctx=Load()), conversion=-1), Constant(value='='), FormattedValue(value=Name(id='value', ctx=Load()), conversion=115)]))], type_ignores=[])


======================================================================
FAIL: test_lambda_parentheses (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 258, in test_lambda_parentheses
    self.check_roundtrip("(lambda: int)()")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[72 chars]=[], vararg=None, kwonlyargs=[], kw_defaults=[[100 chars]=[])" != "Modu[72 chars]=[], kwonlyargs=[], kw_defaults=[], defaults=[[75 chars]=[])"
- Module(body=[Expr(value=Call(func=Lambda(args=arguments(posonlyargs=[], args=[], vararg=None, kwonlyargs=[], kw_defaults=[], kwarg=None, defaults=[]), body=Name(id='int', ctx=Load())), args=[], keywords=[]))], type_ignores=[])
?                                                                                 -------------                                ------------
+ Module(body=[Expr(value=Call(func=Lambda(args=arguments(posonlyargs=[], args=[], kwonlyargs=[], kw_defaults=[], defaults=[]), body=Name(id='int', ctx=Load())), args=[], keywords=[]))], type_ignores=[])


======================================================================
FAIL: test_min_int30 (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 235, in test_min_int30
    self.check_roundtrip(str(-2**31))
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: 'Modu[43 chars]and=Constant(value=2147483648, kind=None)))], type_ignores=[])' != 'Modu[43 chars]and=Constant(value=2147483648)))], type_ignores=[])'
- Module(body=[Expr(value=UnaryOp(op=USub(), operand=Constant(value=2147483648, kind=None)))], type_ignores=[])
?                                                                             -----------
+ Module(body=[Expr(value=UnaryOp(op=USub(), operand=Constant(value=2147483648)))], type_ignores=[])


======================================================================
FAIL: test_negative_zero (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 248, in test_negative_zero
    self.check_roundtrip("-0")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: 'Modu[34 chars]b(), operand=Constant(value=0, kind=None)))], type_ignores=[])' != 'Modu[34 chars]b(), operand=Constant(value=0)))], type_ignores=[])'
- Module(body=[Expr(value=UnaryOp(op=USub(), operand=Constant(value=0, kind=None)))], type_ignores=[])
?                                                                    -----------
+ Module(body=[Expr(value=UnaryOp(op=USub(), operand=Constant(value=0)))], type_ignores=[])


======================================================================
FAIL: test_nonlocal (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 287, in test_nonlocal
    self.check_roundtrip(nonlocal_ex)
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[66 chars]=[], vararg=None, kwonlyargs=[], kw_defaults=[[837 chars]=[])" != "Modu[66 chars]=[], kwonlyargs=[], kw_defaults=[], defaults=[[573 chars]=[])"
Diff is 1657 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_raise_from (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 291, in test_raise_from
    self.check_roundtrip(raise_from)
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[52 chars]lue=1, kind=None), op=Div(), right=Constant(va[234 chars]=[])" != "Modu[52 chars]lue=1), op=Div(), right=Constant(value=0)))], [212 chars]=[])"
Diff is 665 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_relative_import (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 280, in test_relative_import
    self.check_roundtrip(relative_import)
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[15 chars]From(module=None, names=[alias(name='fred', as[201 chars]=[])" != "Modu[15 chars]From(names=[alias(name='fred')], level=1), Imp[149 chars]=[])"
- Module(body=[ImportFrom(module=None, names=[alias(name='fred', asname=None)], level=1), ImportFrom(module=None, names=[alias(name='barney', asname=None)], level=2), ImportFrom(module='australia', names=[alias(name='shrimp', asname='prawns')], level=1)], type_ignores=[])
+ Module(body=[ImportFrom(names=[alias(name='fred')], level=1), ImportFrom(names=[alias(name='barney')], level=2), ImportFrom(module='australia', names=[alias(name='shrimp', asname='prawns')], level=1)], type_ignores=[])


======================================================================
FAIL: test_set_comprehension (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 343, in test_set_comprehension
    self.check_roundtrip("{x for x in range(5)}")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[180 chars]lue=5, kind=None)], keywords=[]), ifs=[], is_a[25 chars]=[])" != "Modu[180 chars]lue=5)], keywords=[]), ifs=[], is_async=0)]))][14 chars]=[])"
Diff is 917 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_set_literal (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 339, in test_set_literal
    self.check_roundtrip("{'a', 'b', 'c'}")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[43 chars]e='a', kind=None), Constant(value='b', kind=No[53 chars]=[])" != "Modu[43 chars]e='a'), Constant(value='b'), Constant(value='c[20 chars]=[])"
- Module(body=[Expr(value=Set(elts=[Constant(value='a', kind=None), Constant(value='b', kind=None), Constant(value='c', kind=None)]))], type_ignores=[])
?                                                     -----------                     -----------                     -----------
+ Module(body=[Expr(value=Set(elts=[Constant(value='a'), Constant(value='b'), Constant(value='c')]))], type_ignores=[])


======================================================================
FAIL: test_shifts (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 202, in test_shifts
    self.check_roundtrip("45 << 2")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: 'Modu[43 chars]ue=45, kind=None), op=LShift(), right=Constant[37 chars]=[])' != 'Modu[43 chars]ue=45), op=LShift(), right=Constant(value=2)))[15 chars]=[])'
- Module(body=[Expr(value=BinOp(left=Constant(value=45, kind=None), op=LShift(), right=Constant(value=2, kind=None)))], type_ignores=[])
?                                                     -----------                                      -----------
+ Module(body=[Expr(value=BinOp(left=Constant(value=45), op=LShift(), right=Constant(value=2)))], type_ignores=[])


======================================================================
FAIL: test_starred_assignment (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 385, in test_starred_assignment
    self.check_roundtrip("a, *b, c = seq")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[171 chars]e(id='seq', ctx=Load()), type_comment=None)], type_ignores=[])" != "Modu[171 chars]e(id='seq', ctx=Load()))], type_ignores=[])"
Diff is 895 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_try_except_finally (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 381, in test_try_except_finally
    self.check_roundtrip(try_except_finally)
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[115 chars]()), name=None, body=[Expr(value=Name(id='suit[252 chars]=[])" != "Modu[115 chars]()), body=[Expr(value=Name(id='suite2', ctx=Lo[230 chars]=[])"
Diff is 827 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_unary_parens (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 212, in test_unary_parens
    self.check_roundtrip("(-1)**7")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: 'Modu[69 chars]lue=1, kind=None)), op=Pow(), right=Constant(v[35 chars]=[])' != 'Modu[69 chars]lue=1)), op=Pow(), right=Constant(value=7)))],[13 chars]=[])'
- Module(body=[Expr(value=BinOp(left=UnaryOp(op=USub(), operand=Constant(value=1, kind=None)), op=Pow(), right=Constant(value=7, kind=None)))], type_ignores=[])
?                                                                               -----------                                    -----------
+ Module(body=[Expr(value=BinOp(left=UnaryOp(op=USub(), operand=Constant(value=1)), op=Pow(), right=Constant(value=7)))], type_ignores=[])


======================================================================
FAIL: test_variable_annotation (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 392, in test_variable_annotation
    self.check_roundtrip("a: int")
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[70 chars]d='int', ctx=Load()), value=None, simple=1)], type_ignores=[])" != "Modu[70 chars]d='int', ctx=Load()), simple=1)], type_ignores=[])"
- Module(body=[AnnAssign(target=Name(id='a', ctx=Store()), annotation=Name(id='int', ctx=Load()), value=None, simple=1)], type_ignores=[])
?                                                                                                 ------------
+ Module(body=[AnnAssign(target=Name(id='a', ctx=Store()), annotation=Name(id='int', ctx=Load()), simple=1)], type_ignores=[])


======================================================================
FAIL: test_while_else (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 209, in test_while_else
    self.check_roundtrip(while_else)
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[66 chars]=[], vararg=None, kwonlyargs=[], kw_defaults=[[372 chars]=[])" != "Modu[66 chars]=[], kwonlyargs=[], kw_defaults=[], defaults=[[243 chars]=[])"
Diff is 862 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_with_as (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 406, in test_with_as
    self.check_roundtrip(with_as)
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[170 chars]'suite1', ctx=Load()))], type_comment=None)], type_ignores=[])" != "Modu[170 chars]'suite1', ctx=Load()))])], type_ignores=[])"
Diff is 891 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_with_simple (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 403, in test_with_simple
    self.check_roundtrip(with_simple)
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[95 chars]s=[]), optional_vars=None)], body=[Expr(value=[66 chars]=[])" != "Modu[95 chars]s=[]))], body=[Expr(value=Name(id='suite1', ct[27 chars]=[])"
- Module(body=[With(items=[withitem(context_expr=Call(func=Name(id='f', ctx=Load()), args=[], keywords=[]), optional_vars=None)], body=[Expr(value=Name(id='suite1', ctx=Load()))], type_comment=None)], type_ignores=[])
?                                                                                                         --------------------                                                    -------------------
+ Module(body=[With(items=[withitem(context_expr=Call(func=Name(id='f', ctx=Load()), args=[], keywords=[]))], body=[Expr(value=Name(id='suite1', ctx=Load()))])], type_ignores=[])


======================================================================
FAIL: test_with_two_items (tests.test_dump.DumpTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../astunparse/tests/common.py", line 410, in test_with_two_items
    self.check_roundtrip(with_two_items)
  File ".../astunparse/tests/test_dump.py", line 24, in check_roundtrip
    self.assertASTEqual(dump1, dump2)
  File ".../astunparse/tests/test_dump.py", line 18, in assertASTEqual
    self.assertEqual(dump1, dump2)
AssertionError: "Modu[293 chars]'suite1', ctx=Load()))], type_comment=None)], type_ignores=[])" != "Modu[293 chars]'suite1', ctx=Load()))])], type_ignores=[])"
Diff is 1377 characters long. Set self.maxDiff to None to see it.

----------------------------------------------------------------------
Ran 94 tests in 0.060s

FAILED (failures=37, skipped=8)
Test failed: <unittest.runner.TextTestResult run=94 errors=0 failures=37>
error: Test failed: <unittest.runner.TextTestResult run=94 errors=0 failures=37>
ERROR: InvocationError for command .../astunparse/.tox/py39/bin/python setup.py test (exited with code 1)
___________________________________ summary ____________________________________
ERROR:   py39: commands failed

[isidentical]

For a little bit context, ast.dump() now omits optional fields/attributes from the output, most of them looks like related with it.

[hroncok]

For a little bit context, ast.dump() now omits optional fields/attributes from the output, most of them looks like related with it.

https://bugs.python.org/issue36287
python/cpython#18843

[isidentical]

• I'm currently working on an omit_defaults parameter, and other kinds of improvements to AST nodes, but it is probably going to land in 3.10.

[hroncok]

This gets the failures down to 13:

diff --git a/lib/astunparse/printer.py b/lib/astunparse/printer.py
index 92d64f7..0a29fbb 100644
--- a/lib/astunparse/printer.py
+++ b/lib/astunparse/printer.py
@@ -19,6 +19,7 @@ class Printer(ast.NodeVisitor):
         self.f.write(six.text_type(text))
 
     def generic_visit(self, node):
+        cls = type(node)
 
         if isinstance(node, list):
             nodestart = "["
@@ -27,7 +28,8 @@ class Printer(ast.NodeVisitor):
         else:
             nodestart = type(node).__name__ + "("
             nodeend = ")"
-            children = [(name + "=", value) for name, value in ast.iter_fields(node)]
+            children = [(name + "=", value) for name, value in ast.iter_fields(node)
+                        if not hasattr(cls, name)]
 
         if len(children) > 1:
             self.indentation += 1

[hroncok]

With a check for None, the fix (workaround?) is complete. I'll submit a PR.

[hroncok]

My fix is at #57 -- frankly I don't know how good it is, but it makes the tests pass on all supported Python versions.

[stefan6419846]

In theory, no current Python package supporting Python since version 3.9 should be required to use this package, as the functionality is available in the stdlib now: https://docs.python.org/3/library/ast.html#ast.unparse python/cpython@27fc3b6