Python builder, the use of yield

Generator: A function that contains the keyword of yield is a generator.

How the Generator works: When the function is called, the function stops when it runs to yield, the return value, and the next time the yield is executed, the local variable or the value of the variable is used. Equivalent to the function in yield is frozen, the next time continue to execute in the yield place.

Why use the generator.

The generator has the advantage of listing all the content at a time:

1. Save more storage space

2. Respond more quickly

3. Use more flexible

As an example:

Generator notation:

Def gen (n)    for I in range (n)            yiled i**2for i in Gen (5)    print (I, "", end= "")


0 1 4) 9 16

General wording:

def Square (n)      for inch range (n)]     return ls  for  in Square (5):    Print(i,"", end ="" )

0 1 4) 9 16

Python builder, the use of yield