The function of Python learning

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function definition:

When no return statement is returned, the result is None

def function name ():    function Body     return value 

Function call:

We can call a function in Python, or we can call a custom function, provided that the correct arguments are passed in

Function parameters:

The function parameter is divided into the required parameter default parameter, the variable parameter, the keyword parameter and the named keyword parameter (the order of the parameter definition is also such)

The *args is a variable parameter and is accepted as a tuple

**KW is a keyword parameter that accepts a dict

Practice:

The following function allows you to calculate the product of two numbers, modify it slightly to accept one or more numbers and calculate the product:

def product (x,*kw):    s=1 for in      range (len (kw)):        s=s* Kw[i]     Print (x*s) product (+/-)

Product (1,2,3,4,5,6)

The results of the operation are as follows:

Thinking:

I didn't know how to do it at first, it was a headache, and here's my thinking steps.

1. Temporarily consider some of the column numbers that can be entered as a variable parameter, using the traversal of a tuple to loop all the numbers out

2. Set an initial variable s and initialize s to 1, after each loop, multiply with s and give s re-assign value

3. Output results can be

Summary:

　　The code is still more thinking, more practice

The function of Python learning