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This article introduces the relevant knowledge of "how to expand the application of python return values and function parameters". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Return value

Enter:

#! / usr/bin/python

# Filename: func_return.py

Def maximum (x, y):

If x > y:

Return x

Else:

Return y

Print (maximum (2,3))

Output:

three

Explanation:

The function is still to give two parameters, after comparing the size, return a larger number.

Here return x; return y returns the value referred to by the parameter.

Extended Application of function parameters

Enter:

#! / usr/bin/python

# Filename: total.py

Def total (initial=5, * numbers, * * keywords):

Count = initial

For number in numbers:

Count + = number

For key in keywords:

Count + = keywords [key]

Return count

Print (total (10,1,2,3, vegetables=50, fruits=100))

Output:

one hundred and sixty six

Explanation:

The function defined in this example takes three parameters, declares an initial with a default value, and declares an asterisk parameter (such as * param), indicating that all positional parameters from that point to the end are collected as a list named "param". Double star parameters (such as * * param) are declared, indicating that all keyword parameters from this point to the end are collected into a dictionary named "param".

During the call, total (10,1Magne2Magne3, vegetables=50, fruits=100), the first parameter is assigned to initial, changing its default value, initial=10, and the latter 1meme2 is included in * numbers as a position parameter, and the next two are included in * * keywords's dictionary as keyword parameters.

Final execution result

10 + 1 + 2 + 3 + 50 + 100 = 166

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