Carambola Python Basics Tutorial - Chapter 7: Python function (two) function returns a value and yield --return

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7.4 function returns a value --return and yield

return : return a call to a function or set of values

yield : each encounter yield when the function will pause and save all of the current operating information, returns the current value of the variable, and when a function is executed the next method continues to run from the current position.

 

yield , for example :

def func(n):
  for i in range(2,n):
    print("i=",i)
    print("i*i=",i*i)
    yield i*i*i

for s in func(5):
  print("s=",s)

Explanation: When func (n-) function is passed the parameter n = 5 , the call will go to func function inside the for loop

for I in Range (2,5) the cycle from 2 starts traverse to 4

First i value of 2 :

Performing Print ( " I =", I ) the output I = 2 , the implementation of Print ( " I * I =", I * I ) output I * I =. 4 , and finally I * I * I

As a whole FUNC (n-) function return value to S , execute print ( "s =", s ) output s = 8

Then i value of 3 :

Performing Print ( " I =", I ) the output I =. 3 , performing Print ( " I * I =", I * I ) output I * I =. 9 , and finally I * I * I

As a whole FUNC (n-) function return value to S , execute print ( "s =", s ) output s = 27

Finally i value of 4 :

Performing Print ( " I =", I ) the output I =. 4 , the implementation of Print ( " I * I =", I * I ) output I * I = 16 , and finally I * I * I

As a whole FUNC (n-) function return value to S , execute print ( "s =", s ) output s = 64

Please 6.6 combined cycle structure - content generator, think carefully about the above example.

 

If you do not use the yield and the use of return , I want to return multiple values function can only be called multiple times.

return example :

def func(i):
  print("i=",i)
  print("i*i=",i*i)
  return i*i*i
s=func(2)
print("s=",s)
s=func(3)
print("s=",s)
s=func(4)
print("s=",s)

运行结果：
i= 2
i*i= 4
s= 8
i= 3
i*i= 9
s= 27
i= 4
i*i= 16
s= 64

Reference Tutorial:

Liao Xuefeng of Python tutorials

https://www.liaoxuefeng.com/wiki/1016959663602400

Liao Xuefeng's Java Tutorial

https://www.liaoxuefeng.com/wiki/1252599548343744

Python3 Tutorial | Tutorial rookie
https://www.runoob.com/python3/
 

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