Error when displaying error that contains unicode characters in Windows #12692
Description
Bug Report
When displaying a type error about e.g. a variable that contains unicode characters, mypy crashes.
To Reproduce
- Make a file
file.pycontaining the linex=γ. - Run
mypy.exe --show-column-numbers file.pythrough flycheck (python-mypy) in Emacs
Expected Behavior
An error message like file.py:1:5: error: Name "γ" is not defined
Actual Behavior
It crashes and prints a stack trace:
File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python39_64\lib\runpy.py", line 197, in _run_module_as_main
return _run_code(code, main_globals, None,
File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python39_64\lib\runpy.py", line 87, in _run_code
exec(code, run_globals)
File "c:\Program Files (x86)\Microsoft Visual Studio\Shared\Python39_64\Scripts\mypy.exe\__main__.py", line 7, in <module>
File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python39_64\lib\site-packages\mypy\__main__.py", line 15, in console_entry
main(None, sys.stdout, sys.stderr)
File "mypy\main.py", line 96, in main
File "mypy\main.py", line 173, in run_build
File "mypy\build.py", line 180, in build
File "mypy\build.py", line 256, in _build
File "mypy\build.py", line 2717, in dispatch
File "mypy\build.py", line 3048, in process_graph
File "mypy\build.py", line 3164, in process_stale_scc
File "mypy\main.py", line 165, in flush_errors
File "mypy\main.py", line 199, in show_messages
File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python39_64\lib\encodings\cp1252.py", line 19, in encode
return codecs.charmap_encode(input,self.errors,encoding_table)[0]
UnicodeEncodeError: 'charmap' codec can't encode character '\u03b3' in position 33: character maps to <undefined>
I've fixed it locally by adding
sys.stdout.reconfigure(encoding='utf-8')
sys.stderr.reconfigure(encoding='utf-8')
in mypy/__main__.py. It works for me, but I don't know whether it's the right thing for mypy.
Your Environment
Python 3.9.7, mypy 0.931 on Windows
- Mypy version used: 0.931
- Mypy command-line flags: --show-column-numbers
- Mypy configuration options from
mypy.ini(and other config files): None, I think - Python version used: 3.9.7
- Operating system and version: Windows 11