bpo-45019: Clean up the frozen __hello__ module. (gh-28374)

Here's one more small cleanup that should have been in PR gh-28319. We eliminate stdout side-effects from importing the frozen __hello__ module, and update tests accordingly. We also move the module's source file into Lib/ from Toos/freeze/flag.py.

https://bugs.python.org/issue45019

Author: ericsnowcurrently

Lib/__hello__.py

@@ -0,0 +1,7 @@
+initialized = True
+
+def main():
+    print("Hello world!")
+
+if __name__ == '__main__':
+    main()

Lib/ctypes/test/test_values.py

@@ -7,7 +7,7 @@
 import unittest
 import sys
 from ctypes import *
-from test.support import import_helper, captured_stdout
+from test.support import import_helper
 
 import _ctypes_test
 

Lib/test/test_frozen.py

@@ -21,8 +21,9 @@ def test_frozen(self):
         if name in sys.modules:
             del sys.modules[name]
         with import_helper.frozen_modules():
-            with captured_stdout() as out:
-                import __hello__
+            import __hello__
+        with captured_stdout() as out:
+            __hello__.main()
         self.assertEqual(out.getvalue(), 'Hello world!\n')
 
 

Lib/test/test_importlib/frozen/test_loader.py

@@ -21,12 +21,11 @@ def deprecated():
 def fresh(name, *, oldapi=False):
     with util.uncache(name):
         with import_helper.frozen_modules():
-            with captured_stdout() as stdout:
-                if oldapi:
-                    with deprecated():
-                        yield stdout
-                else:
-                    yield stdout
+            if oldapi:
+                with deprecated():
+                    yield
+            else:
+                yield
 
 
 class ExecModuleTests(abc.LoaderTests):
@@ -44,8 +43,10 @@ def exec_module(self, name):
         module.__spec__ = spec
         assert not hasattr(module, 'initialized')
 
-        with fresh(name) as stdout:
+        with fresh(name):
             self.machinery.FrozenImporter.exec_module(module)
+        with captured_stdout() as stdout:
+            module.main()
 
         self.assertTrue(module.initialized)
         self.assertTrue(hasattr(module, '__spec__'))
@@ -119,8 +120,10 @@ def test_unloadable(self):
 class LoaderTests(abc.LoaderTests):
 
     def load_module(self, name):
-        with fresh(name, oldapi=True) as stdout:
+        with fresh(name, oldapi=True):
             module = self.machinery.FrozenImporter.load_module(name)
+        with captured_stdout() as stdout:
+            module.main()
         return module, stdout
 
     def test_module(self):
@@ -165,15 +168,18 @@ def test_lacking_parent(self):
         self.assertFalse(hasattr(module, '__file__'))
 
     def test_module_reuse(self):
-        with fresh('__hello__', oldapi=True) as stdout:
+        with fresh('__hello__', oldapi=True):
             module1 = self.machinery.FrozenImporter.load_module('__hello__')
             module2 = self.machinery.FrozenImporter.load_module('__hello__')
+        with captured_stdout() as stdout:
+            module1.main()
+            module2.main()
         self.assertIs(module1, module2)
         self.assertEqual(stdout.getvalue(),
                          'Hello world!\nHello world!\n')
 
     def test_module_repr(self):
-        with fresh('__hello__', oldapi=True) as stdout:
+        with fresh('__hello__', oldapi=True):
             module = self.machinery.FrozenImporter.load_module('__hello__')
             repr_str = self.machinery.FrozenImporter.module_repr(module)
         self.assertEqual(repr_str,
@@ -203,11 +209,12 @@ class InspectLoaderTests:
     def test_get_code(self):
         # Make sure that the code object is good.
         name = '__hello__'
+        with import_helper.frozen_modules():
+            code = self.machinery.FrozenImporter.get_code(name)
+            mod = types.ModuleType(name)
+            exec(code, mod.__dict__)
         with captured_stdout() as stdout:
-            with import_helper.frozen_modules():
-                code = self.machinery.FrozenImporter.get_code(name)
-                mod = types.ModuleType(name)
-                exec(code, mod.__dict__)
+            mod.main()
         self.assertTrue(hasattr(mod, 'initialized'))
         self.assertEqual(stdout.getvalue(), 'Hello world!\n')
 

Makefile.pre.in

@@ -783,8 +783,8 @@ Python/frozen_modules/posixpath.h: Programs/_freeze_module Lib/posixpath.py
 Python/frozen_modules/stat.h: Programs/_freeze_module Lib/stat.py
 	$(srcdir)/Programs/_freeze_module stat $(srcdir)/Lib/stat.py $(srcdir)/Python/frozen_modules/stat.h
 
-Python/frozen_modules/hello.h: Programs/_freeze_module Tools/freeze/flag.py
-	$(srcdir)/Programs/_freeze_module hello $(srcdir)/Tools/freeze/flag.py $(srcdir)/Python/frozen_modules/hello.h
+Python/frozen_modules/__hello__.h: Programs/_freeze_module Lib/__hello__.py
+	$(srcdir)/Programs/_freeze_module __hello__ $(srcdir)/Lib/__hello__.py $(srcdir)/Python/frozen_modules/__hello__.h
 
 # END: freezing modules
 
@@ -1030,7 +1030,7 @@ FROZEN_FILES = \
 		$(srcdir)/Python/frozen_modules/ntpath.h \
 		$(srcdir)/Python/frozen_modules/posixpath.h \
 		$(srcdir)/Python/frozen_modules/stat.h \
-		$(srcdir)/Python/frozen_modules/hello.h
+		$(srcdir)/Python/frozen_modules/__hello__.h
 # End FROZEN_FILES
 
 Python/frozen.o: $(FROZEN_FILES)

PCbuild/_freeze_module.vcxproj

@@ -245,10 +245,10 @@
       <IntFile>$(IntDir)zipimport.g.h</IntFile>
       <OutFile>$(PySourcePath)Python\frozen_modules\zipimport.h</OutFile>
     </None>
-    <None Include="..\Tools\freeze\flag.py">
-      <ModName>hello</ModName>
-      <IntFile>$(IntDir)hello.g.h</IntFile>
-      <OutFile>$(PySourcePath)Python\frozen_modules\hello.h</OutFile>
+    <None Include="..\Lib\__hello__.py">
+      <ModName>__hello__</ModName>
+      <IntFile>$(IntDir)__hello__.g.h</IntFile>
+      <OutFile>$(PySourcePath)Python\frozen_modules\__hello__.h</OutFile>
     </None>
     <!-- END frozen modules -->
   </ItemGroup>

PCbuild/_freeze_module.vcxproj.filters

@@ -25,7 +25,7 @@
     <None Include="..\Lib\zipimport.py">
       <Filter>Python Files</Filter>
     </None>
-    <None Include="..\Tools\freeze\flag.py">
+    <None Include="..\Lib\__hello__.py">
       <Filter>Python Files</Filter>
     </None>
     <!-- END frozen modules -->

Python/frozen.c

@@ -49,7 +49,7 @@
 #include "frozen_modules/ntpath.h"
 #include "frozen_modules/posixpath.h"
 #include "frozen_modules/stat.h"
-#include "frozen_modules/hello.h"
+#include "frozen_modules/__hello__.h"
 /* End includes */
 
 /* Note that a negative size indicates a package. */
@@ -74,9 +74,9 @@ static const struct _frozen _PyImport_FrozenModules[] = {
     {"stat", _Py_M__stat, (int)sizeof(_Py_M__stat)},
 
     /* Test module */
-    {"__hello__", _Py_M__hello, (int)sizeof(_Py_M__hello)},
-    {"__phello__", _Py_M__hello, -(int)sizeof(_Py_M__hello)},
-    {"__phello__.spam", _Py_M__hello, (int)sizeof(_Py_M__hello)},
+    {"__hello__", _Py_M____hello__, (int)sizeof(_Py_M____hello__)},
+    {"__phello__", _Py_M____hello__, -(int)sizeof(_Py_M____hello__)},
+    {"__phello__.spam", _Py_M____hello__, (int)sizeof(_Py_M____hello__)},
     {0, 0, 0} /* sentinel */
 };