Python 3.5+ 允许在函数单次调用中使用多个集合进行关键字传参。语法为在变量前使用双星号“**”。

# Python 3.5+ allows passing multiple sets
# of keyword arguments ("kwargs") to a
# function within a single call, using
# the "**" syntax:

>>> def process_data(a, b, c, d):
>>>    print(a, b, c, d)

>>> x = {'a': 1, 'b': 2}
>>> y = {'c': 3, 'd': 4}

>>> process_data(**x, **y)
1 2 3 4

>>> process_data(**x, c=23, d=42)
1 2 23 42