Return value of Python function

Python The return value of the function

• ​​ One 、 Preface ​​
• ​​ Two 、 Return value syntax format ​​
• ​​ 3、 ... and 、 Return value syntax instance ​​

One 、 Preface

We create functions that just do something for us , When it's done, it's over . But actually , Sometimes we need to get the results of things . It's like a supervisor giving orders to junior staff , Staff to do it , Finally, the results need to be reported to the supervisor , The purpose of setting the return value for a function is to return the processing result of the function to the calling program .

Two 、 Return value syntax format

stay Python in , Can be used inside a function return Statement specifies a return value for a function . The return value can be of any type , And no matter return Where does the statement appear in the function , As long as it's implemented , It will directly end the execution of the function .

return The syntax format of the statement is as follows ：

result
=
return [
value]


1.

Parameter description ：

• result： Used to save returned results , If it's a value , that result What is saved in is a value returned , The value can be of any type . If multiple values are returned , that result A tuple is stored in .
• value： Optional parameters , Used to specify the value to return , Can return a value , Multiple values can also be returned .

explain ： When there is no return When the sentence is , Or omitted return Statement , Will return None, Return null value .

3、 ... and 、 Return value syntax instance

for example , Define a function , Used according to the name entered by the user , Get its nickname , Then call the function outside the function , And get the return value , The code is as follows ：

def
fun_checkout(
name):


nickName
=
""


if
name
==
" Xiaohong ":
# If the input is Xiao Hong 


nickName
=
" The demon "


elif
name
==
" Xiao Ming ":


nickName
=
" unhappy "


elif
name
==
" Xiao Cong ":


nickName
=
" No head "


else:


nickName
=
" The information you entered cannot be found "




return
nickName
# Returns the nickname of the corresponding person's name 






# ****************** Call function ******************** #




while
True:


name
=
input(
" Please enter the name of the person you want to query ")
# Receive user input 


nickname
=
fun_checkout(
name)
# Call function 


print(
" full name ：",
name,
" nickname ：",
nickname)


1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.

The running results are as follows ：