检查程序是否在调试模式下运行 [英] Check if program runs in Debug mode

问题描述

我使用 PyCharm IDE 进行 Python 编程.

是否有可能在我运行程序时检查我是否处于调试模式?

我使用 pyplot 作为 plt，并且只希望在调试程序时显示一个 Figure.是的，我可以有一个自己设置的全局布尔 _debug_，但我正在寻找更好的解决方案.

解决方案

根据文档，可以使用 settrace/gettrace 函数来实现 Python 调试器:

<块引用>

sys.settrace(tracefunc)

设置系统的trace功能，允许您可以在 Python 中实现 Python 源代码调试器.功能是线程特定的；对于支持多线程的调试器，它必须使用 settrace() 为每个正在调试的线程注册.

但是，这些方法可能并非在所有实现中都可用:

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CPython 实现细节:settrace() 函数旨在仅用于实现调试器、分析器、覆盖工具和喜欢.它的行为是实现平台的一部分，而不是语言定义的一部分，因此可能并非全部可用Python 实现.

您可以使用以下代码段来检查是否有人在调试您的代码:

导入系统gettrace = getattr(sys, 'gettrace', 无)如果 gettrace 为无:print('没有 sys.gettrace')elif gettrace():print('嗯，大调试器在看着我')别的:print("让我们做一些有趣的事情")打印(1/0)

这个适用于 pdb:

$ python -m pdb main.py>/home/soon/Src/Python/main/main.py(3)<模块>()->导入系统(pdb) 步骤>/home/soon/Src/Python/main/main.py(6)<模块>()->gettrace = getattr(sys, 'gettrace', 无)(pdb) 步骤>/home/soon/Src/Python/main/main.py(8)<模块>()->如果 gettrace 为无:(pdb) 步骤>/home/soon/Src/Python/main/main.py(10)<模块>()->elif gettrace():(pdb) 步骤>/home/soon/Src/Python/main/main.py(11)<模块>()->print('嗯，大调试器在看着我')(pdb) 步骤嗯，大调试器在看着我- 返回 ->/home/soon/Src/Python/main/main.py(11)<module>()->无->print('嗯，大调试器在看着我')

还有 PyCharm:

/usr/bin/python3/opt/pycharm-professional/helpers/pydev/pydevd.py --multiproc --qt-support --client 127.0.0.1 --port 34192 --file/home/很快/Src/Python/main/main.pypydev 调试器:进程 17250 正在连接连接到 pydev 调试器(内部版本 143.1559)嗯，大调试器在看着我进程以退出代码 0 结束

I use the PyCharm IDE for Python programming.

Is there a possibility to check, whether I'm in debugging mode or not when I run my program?

I use pyplot as plt and want a Figure only to be shown if I debug my program. Yes, I could have a global boolean _debug_ which is set by myself, but I look for a better solution.

解决方案

According to the documentation, settrace / gettrace functions could be used in order to implement Python debugger:

sys.settrace(tracefunc) 

Set the system’s trace function, which allows you to implement a Python source code debugger in Python. The function is thread-specific; for a debugger to support multiple threads, it must be registered using settrace() for each thread being debugged.

However, these methods may not be available in all implementations:

CPython implementation detail: The settrace() function is intended only for implementing debuggers, profilers, coverage tools and the like. Its behavior is part of the implementation platform, rather than part of the language definition, and thus may not be available in all Python implementations.

You could use the following snippet in order to check if someone is debugging your code:

import sys


gettrace = getattr(sys, 'gettrace', None)

if gettrace is None:
    print('No sys.gettrace')
elif gettrace():
    print('Hmm, Big Debugger is watching me')
else:
    print("Let's do something interesting")
    print(1 / 0)

This one works for pdb:

$ python -m pdb main.py 
> /home/soon/Src/Python/main/main.py(3)<module>()
-> import sys
(Pdb) step
> /home/soon/Src/Python/main/main.py(6)<module>()
-> gettrace = getattr(sys, 'gettrace', None)
(Pdb) step
> /home/soon/Src/Python/main/main.py(8)<module>()
-> if gettrace is None:
(Pdb) step
> /home/soon/Src/Python/main/main.py(10)<module>()
-> elif gettrace():
(Pdb) step
> /home/soon/Src/Python/main/main.py(11)<module>()
-> print('Hmm, Big Debugger is watching me')
(Pdb) step
Hmm, Big Debugger is watching me
--Return--
> /home/soon/Src/Python/main/main.py(11)<module>()->None
-> print('Hmm, Big Debugger is watching me')

And PyCharm:

/usr/bin/python3 /opt/pycharm-professional/helpers/pydev/pydevd.py --multiproc --qt-support --client 127.0.0.1 --port 34192 --file /home/soon/Src/Python/main/main.py
pydev debugger: process 17250 is connecting

Connected to pydev debugger (build 143.1559)
Hmm, Big Debugger is watching me

Process finished with exit code 0

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