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This article mainly introduces the difference between * args and * * kwargs in Python, which has a certain reference value. Interested friends can refer to it. I hope you can learn a lot after reading this article.

I believe that friends who learn from Python must have such an awkward situation, giving a function can not be used.

The reason is: do not know the meaning of the type in the parameter list, for example, beginners will ask: * args and * kwargs exactly how to use.

When you know this, I guess you can use a lot of functions!

# * usage of args: when the number of parameters passed is unknown and you do not need to know the parameter name.

Def func_arg (farg, * args): print ("formal arg:", farg) for arg in args: print ("another arg:", arg) func_arg (1, "youzan", 'dba',' $4.50') print ("- -")

# the output is as follows:

# formal arg: 1

# another arg: youzan

# another arg: dba

# another arg: a girl of $4.50

#

# * * usage of kwargs: when the number of parameters passed in is unknown, but you need to know the name of the parameter (you immediately think of a dictionary, that is, key-value pairs)

Def func_kwargs (farg, * * kwargs): print ("formal arg:", farg) for key in kwargs: print ("keyword arg:% s:% s"% (key, kwargs [key])) func_kwargs (1, id=1, name='youzan', city='hangzhou',age ='20', $4.50) print ('-')

# the output is as follows:

# formal arg: 1

# keyword arg: id: 1

# keyword arg: name: youzan

# keyword arg: city: hangzhou

# keyword arg: age: 20

# keyword arg: the girl who costs $4.50 will have a long time to come.

Use it to convert parameters to dictionaries

Def kw_dict (* * kwargs): return kwargsprint (kw_dict (axi1 ~ 2 ~ 3))

The output is as follows:

#-

# {'asides: 1,' breadth: 2, 'cations: 3}

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