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This also happens on a Western Windows (cp437, mbcs==cp1252) with a
filename like "café.py".
The attached patch corrects three problems:
- in compile.c, the c_filename member has utf8 encoding, and must not be
decoded with PyUnicode_DecodeFSDefault. This is the reported issue.
- Same thing in pythonrun.c, if you want "print(__file__)" to work.
- in traceback.c, the content of the file is not shown.
Tested with this script:
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print("file name:", __file__)
import traceback
try:
 aaa
except:
 traceback.print_exc()
 raise
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The output should be:
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file name: c:\temp\café.py
Traceback (most recent call last):
 File "c:\temp\café.py", line 4, in <module>
 aaa
NameError: name 'aaa' is not defined
Traceback (most recent call last):
 File "c:\temp\café.py", line 4, in <module>
 aaa
NameError: name 'aaa' is not defined
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