Mac Pycharm在Debug模式报编码（SyntaxError）错误

CodeManBill2023-12-30 11:43

1. 错误信息：

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Traceback (most recent call last):
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/tokenize.py", line 330, in find_cookie
    line_string = line.decode('utf-8')
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xca in position 0: invalid continuation byte

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/tokenize.py", line 394, in open
    encoding, lines = detect_encoding(buffer.readline)
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/tokenize.py", line 371, in detect_encoding
    encoding = find_cookie(first)
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.9/lib/python3.9/tokenize.py", line 335, in find_cookie
    raise SyntaxError(msg)
SyntaxError: invalid or missing encoding declaration for '/Users/willow/WorkSpaces/PycharmProjects/panda-hub/venv/bin/Python'

2. 解决思路

试过很多方案，什么在文件头加utf8编码，或者idea设置编码为utf8，结果都没用，偶然发现在脚本环境运行和非debug模式运行都没有问题，那么肯定就是debug的问题，所以看了配置。发现了问题所在。

3. 解决方案

去掉这个 Attach to subprocess automatically while debugging

官方解释： If this checkbox is selected, PyCharm will automatically attach all subprocesses of the process being debugged. Thus, if the parent process has subprocesses, their breakpoints will always work.

中文：如果选中此复选框，PyCharm将自动附加正在调试的进程的所有子进程。因此，如果父进程有子进程，它们的断点将始终有效。

白话：debug方式启动的时候，是多进程的，看下面的命令：

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venv/bin/Python /Applications/PyCharm.app/Contents/plugins/python/helpers/pydev/pydevd.py --multiprocess --qt-support=auto --client 127.0.0.1 --port 55207 --file /Users/willow/WorkSpaces/PycharmProjects/panda-hub/main.py

也就是说，这个编码错误实在运行子进程的时候解释代码导致的。那么为什么在非debug模式没有这个问题？因为"pyc文件"