1.The “freeze_support()” line can be omitted if the programis not going to be frozen to produce an executable. 
錯誤資訊：

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

        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.

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解決方法： 
把呼叫程式碼移到main函式中執行即可

if __name__ == '__main__':
    #程式程式碼

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即可