globals() 返回全局变量字典

内置函数 globals()，Python 官方文档描述如下：

help(globals)

Help on built-in function globals in module builtins:

globals()
    Return the dictionary containing the current scope's global variables.
    
    NOTE: Updates to this dictionary *will* affect name lookups in the current
    global scope and vice-versa.

返回包含当前作用域的全局变量字典。这总是当前模块的字典（在函数或方法中，不是调用它的模块，而是定义它的模块）。

更新此字典 将 影响当前全局范围内的名称查找，反之亦然。

globals() 和 locals() 函数各自返回当前的全局和本地字典，因此可以将它们传递给 eval() 或 exec() 来使用。

globals()

{'__name__': '__main__',
 '__doc__': 'Automatically created module for IPython interactive environment',
 '__package__': None,
 '__loader__': None,
 '__spec__': None,
 '__builtin__': <module 'builtins' (built-in)>,
 '__builtins__': <module 'builtins' (built-in)>,
 '_ih': ['', 'help(globals)', 'globals()'],
 '_oh': {},
 '_dh': ['D:\\Jupyter\\xuecn_books\\books\\xue_python_kp\\11_built-in_function'],
 'In': ['', 'help(globals)', 'globals()'],
 'Out': {},
 'get_ipython': <bound method InteractiveShell.get_ipython of <ipykernel.zmqshell.ZMQInteractiveShell object at 0x000001E15E70D748>>,
 'exit': <IPython.core.autocall.ZMQExitAutocall at 0x1e160f63978>,
 'quit': <IPython.core.autocall.ZMQExitAutocall at 0x1e160f63978>,
 '_': '',
 '__': '',
 '___': '',
 '_i': 'help(globals)',
 '_ii': '',
 '_iii': '',
 '_i1': 'help(globals)',
 '_i2': 'globals()'}