Python function basics

function is to encapsulate a piece of common code in the program, a name, the other parts of the program can be easily called

Definition of a function

def function name (parameter 1, parameter 2 ...)

Do something ...

return value/object, function, etc.

# CODING:GBK def Python_class (n):     Print (" Saturday has%s bit to learn python" % n    ) return Truepython_class (20)

Parameter type

1: Normal
2: Default parameter
3: Variable length parameter

# CODING:GBK def Test_args (a,b=1):    print(    b)print(A +b)    test _args (3) Test_args (3,2)

Variable length parameter : when calling a function, you can pass in any number of arguments in any form.

* On behalf of Ganso, all parameters with no key specified will be placed in a tuple.

* * means that the dictionary will put all the parameters of the specified key into the dictionary.

*args:tuple

**kwargs: That's when you pass in Key=value is a stored dictionary

# CODING:GBK def Test_args (*args,**Kwargs):    print(Args,kwargs)    Test_args (3,5,a=1 , b=2)

return value of the function

# CODING:GBK def Test (m,n):     return M,n Print (Test (1,2A))

Python function basics