【Python】One interesting way to unlock the package(Tuple & Dict)

kikook

于 2018-10-15 01:29:11 发布

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本文链接：https://blog.youkuaiyun.com/chenhanxuan1999/article/details/83053406

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本文深入探讨了Python中函数参数的正确使用方式，特别是*args和**kwargs的运用，避免常见错误，如不当的字符串引用和字典定义。同时，文章提供了正确的参数赋值示例，并回顾了字典遍历的方法。

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def unlocker(*args, **kwargs):
    print(*arg)
    for key in kwargs.keys():
        print(key, ":", kwargs[key])

I have to announce that I have grabed something new from the practices:

I found that we should not add "" around the keyword arguments or it will break down, however if we try to write like defining a dict, it will also break down.

The two wrong ways to assign the arguments and the right way when facing **kwargs:

unlocker("arg1", "arg2", "arg3" ,"kwarg1" = 1, "kwarg2" = 2, "kwarg3" = 3) 
# wrong ! It should be like ->    kwarg1 = 1 ,  kwarg2 = 2, kwarg3 = 3

unlocker("arg1", "arg2", "arg3", kwarg1 : 1, kwarg2 : 2, kwarg3 : 3)
# wrong ! It should be like ->    kwarg1 = 1 ,  kwarg2 = 2, kwarg3 = 3

unlocker("arg1", "arg2", "arg3", kwarg1 = 1 ,  kwarg2 = 2, kwarg3 = 3)
#right !

And review another way of visiting the keys and values in dict:

dict_test = {1:"one", 2:"two", "three":3}

for key,value in dict_test.items():
    print(key,":",value)

In the end, remember that we should not add blank space between the keyword like -> a name = 1,it doesn't work actually.