globals()返回一个字典，其包含当前上下文所有的全局变量。

locals()干的是一样的活，但返回的

# "globals()" returns a dict
# with all global variables
# in the current scope:

>>> globals()
{...}

# "locals()" does the same
# but for all local variables
# in the current scope:

>>> locals()
{...}