【Error】 RuntimeError: An attempt has been made to start a new process before the current process

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文章主要介绍了在Python中遇到RuntimeError，提示尝试在初始化阶段启动新进程的问题。解决方案是添加`freeze_support()`，并解释了这通常意味着不是使用fork来创建子进程，或者在主模块中忘记了正确的idiom。如果程序不打算冻结生成可执行文件，`freeze_support()`可以省略。

报错信息：

【Error】 RuntimeError: An attempt has been made to start a new process before the current process has finished its bootstrapping phase.

问题描述

解决方案：

加上freeze_support()

    This probably means that you are not using fork to start your
    child processes and you have forgotten to use the proper idiom
    in the main module:

        if __name__ == '__main__':
            freeze_support()
            ...

    The "freeze_support()" line can be omitted if the program
    is not going to be frozen to produce an executable.