简述:
*args: 可变长度元组参数
**kwargs: 可变长度字典参数
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详解:
【*args】:可变长度元组参数
例1:
def hello_args(para1, *args):
print("para1 :", para1)
for arg in args:
print("args:", arg)
print("type(args):", type(args))
hello_args('hello', 'this', 'is', 'mc.meng')
输出:
para1 : hello
args: this
args: is
args: mc.meng
type(args): <class 'tuple'>
可以看到,函数hello_args把第一个参数传给了位置参数(positional arguments)para1,把剩下的参数作为一个元组传给了*args。
【**kwargs】:可变长度字典参数
例2:
def hello_kwargs(para1, **kwargs):
print("para1 :", para1)
for key, value in kwargs.items():
print("{0} = {1}".format(key, value))
print("type(kwargs):", type(kwargs))
hello_kwargs("hello", key1=1, key2=2, key3=3)
输出:
para1 : hello
key1 = 1
key2 = 2
key3 = 3
type(kwargs): <class 'dict'>
或者还你可以把直接传入一个字典:
例3:
def hello_kwargs(para1, **kwargs):
print("para1 :", para1)
for key, value in kwargs.items():
print("{0} = {1}".format(key, value))
print("type(kwargs):", type(kwargs))
thiskw = {"key1": 1, "key2": "two", "key3": 3}
hello_kwargs("hello", **thiskw)
输出:
para1 : hello
key1 = 1
key2 = two
key3 = 3
type(kwargs): <class 'dict'>
但请注意:实参thiskw前面的**
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作者:menghaocheng
来源:CSDN
原文:https://blog.csdn.net/menghaocheng/article/details/79891263
版权声明:本文为博主原创文章,转载请附上博文链接!
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