ipykernel unconditionally calls `sys.stdout.flush()`
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- Dominant language
- Python
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Description
ipykernel unconditionally calls `sys.stdout.flush()` and `sys.stderr.flush()`. This is a problem when either `sys.stdout` or `sys.stderr` is `None`, such as in `pythonw.exe` on windows, or Pyinstaller's windowed mode. All of these checks should be garded with a not-None check.
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