Python grammar practice_iterator 2

Python grammar practice

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Today I will continue to share with you some Python grammar exercises_Iterator 2
#博学谷IT学报技术支持

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foreword

Iterator Case 2_Custom range function

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1. Iterator case

Through this iterator case, familiarize yourself with the use of iterators

class MyRange(object):
    def __init__(self, num):
        self.num = num

    def __iter__(self):
        return MyRangeIter(self.num)


class MyRangeIter(object):
    def __init__(self, stop_num):
        self.stop_num = stop_num
        self.index = 0

    def __next__(self):
        if self.index == self.stop_num:
            raise StopIteration
        temp = self.index
        self.index += 1
        return temp


if __name__ == '__main__':
    for i in MyRange(10):
        print(i)

2. Iterator yield method change

class MyRange(object):
    def __init__(self, num):
        self.num = num

    def __iter__(self):
        number = 0
        while number < self.num:
            yield number
            number += 1


if __name__ == '__main__':
    for i in MyRange(10):
        print(i)

3. Generator

generator = iterator + iterable

# 生成器原理
# class MyGenerator(object):
# 
#     def __init__(self, stop_value):
#         self.stop_value = stop_value
#         self.begin = 0
# 
#     def __iter__(self):
#         return self
# 
#     def __next__(self):
#         temp = self.begin
#         if temp >= self.stop_value:
#             raise StopIteration
#         self.begin += 1
#         return temp

# 定义一个生成器
def my_range(stop_value):
    number = 0
    while number < stop_value:
        yield number
        number += 1


if __name__ == '__main__':
    my01 = my_range(10)

    for i in my01:
        print(i)

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Summarize

Iterator Exercise 2: Implementing the range function through iterators