英文文档：
globals()
return a dictionary representing the current global symbol table. this is always the dictionary of the current module (inside a function or method, this is the module where it is defined, not the module from which it is called).
说明：
1. 返回当前作用域内全局变量的字典。
>>> globals()
{‘__spec__’: none, ‘__package__’: none, ‘__builtins__’: , ‘__name__’: ‘__main__’, ‘__doc__’: none, ‘__loader__’: }
>>> a = 1
>>> globals() #多了一个a
{‘__spec__’: none, ‘__package__’: none, ‘__builtins__’: , ‘a’: 1, ‘__name__’: ‘__main__’, ‘__doc__’: none, ‘__loader__’: }
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