0.偶然间看到一个奇怪的现象
>>> x = 1
>>> a = var()
>>> a['x']
1
这是啥操作？？用help(vars)之后，我才知道……
>>> help(vars)
Help on built-in function vars in module builtins:
vars(...)
vars([object]) -> dictionary
Without arguments, equivalent to locals().
With an argument, equivalent to object.__dict__.
如果，没传入参数就将相当
