An article takes you through python iterators and generators

Directory python Iterators and Generators 1. Iterator
2. Generator Summary

python Iterators and Generators

1. Iterator

Here, use a dictionary example

while True belongs to an infinite loop. Because the dictionary elements are limited, try is used for exception handling

dict1 = {
    'name':'laowang',
    'age':18,
    'high':180
}
iterator = dict1.__iter__()
while True:
    try:
        res = iterator.__next__()
    except:
        break
    else:
        print(res,dict1[res]

Results:

name laowang
age 18
high 180

2. Generator

First, look at the derivation of the following list

list1 = [i for i in range(1,10)]
#  Results 
[1, 2, 3, 4, 5, 6, 7, 8, 9]

Generator

list1 = (i for i in range(1,10))
#  Results 
<generator object <genexpr> at 0x7fa491ea3410>
# generator  Generator 
# Generator function 
def func1():
    for i in range(1,10):
        yield i
res = func1() # Generator object 
for i in res:
    print(i)

Summarize

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