inspect.signature throws RuntimeError on select.epoll.register

[hauntsaninja]

BPO	39504
Nosy	@hauntsaninja

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-01-31.02:12:38.905>
labels = ['library']
title = 'inspect.signature throws RuntimeError on select.epoll.register'
updated_at = <Date 2020-01-31.02:12:38.905>
user = 'https://github.com/hauntsaninja'

bugs.python.org fields:

activity = <Date 2020-01-31.02:12:38.905>
actor = 'hauntsaninja'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-01-31.02:12:38.905>
creator = 'hauntsaninja'
dependencies = []
files = []
hgrepos = []
issue_num = 39504
keywords = []
message_count = 1.0
messages = ['361089']
nosy_count = 1.0
nosy_names = ['hauntsaninja']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue39504'
versions = []

[hauntsaninja]

From the documentation of inspect.signature it seems we should never have a RuntimeError:

Raises ValueError if no signature can be provided, and TypeError if that type of object is not supported.

The easiest thing to do is just turn the RuntimeError into a ValueError... but I'll take a deeper look and see if I can actually fix this.

Traceback below:

>>> import sys
>>> sys.version
'3.8.0 (default, Nov 14 2019, 22:29:45) \n[GCC 5.4.0 20160609]'
>>> import inspect
>>> import select
>>> inspect.signature(select.epoll.register)
Traceback (most recent call last):
  File "/usr/lib/python3.8/inspect.py", line 2004, in wrap_value
    value = eval(s, module_dict)
  File "<string>", line 1, in <module>
NameError: name 'EPOLLIN' is not defined
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/usr/lib/python3.8/inspect.py", line 2007, in wrap_value
    value = eval(s, sys_module_dict)
  File "<string>", line 1, in <module>
NameError: name 'EPOLLIN' is not defined
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.8/inspect.py", line 3093, in signature
    return Signature.from_callable(obj, follow_wrapped=follow_wrapped)
  File "/usr/lib/python3.8/inspect.py", line 2842, in from_callable
    return _signature_from_callable(obj, sigcls=cls,
  File "/usr/lib/python3.8/inspect.py", line 2296, in _signature_from_callable
    return _signature_from_builtin(sigcls, obj,
  File "/usr/lib/python3.8/inspect.py", line 2109, in _signature_from_builtin
    return _signature_fromstr(cls, func, s, skip_bound_arg)
  File "/usr/lib/python3.8/inspect.py", line 2057, in _signature_fromstr
    p(name, default)
  File "/usr/lib/python3.8/inspect.py", line 2039, in p
    default_node = RewriteSymbolics().visit(default_node)
  File "/usr/lib/python3.8/ast.py", line 360, in visit
    return visitor(node)
  File "/usr/lib/python3.8/ast.py", line 445, in generic_visit
    new_node = self.visit(old_value)
  File "/usr/lib/python3.8/ast.py", line 360, in visit
    return visitor(node)
  File "/usr/lib/python3.8/ast.py", line 445, in generic_visit
    new_node = self.visit(old_value)
  File "/usr/lib/python3.8/ast.py", line 360, in visit
    return visitor(node)
  File "/usr/lib/python3.8/inspect.py", line 2031, in visit_Name
    return wrap_value(node.id)
  File "/usr/lib/python3.8/inspect.py", line 2009, in wrap_value
    raise RuntimeError()
RuntimeError