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loop.py
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38 lines (29 loc) · 934 Bytes
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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
"""
Topic: 各种迭代示例
Desc :
"""
def loop_demo():
# dict的迭代
knights = {'gallahad': 'the pure', 'robin': 'the brave'}
for k, v in knights.items():
print(k, v)
# sequence序列迭代：
for i, v in enumerate(['tic', 'tac', 'toe']):
print(i, v)
# 同时迭代多个序列，使用zip函数
questions = ['name', 'quest', 'favorite color']
answers = ['lancelot', 'the holy grail', 'blue']
for q, a in zip(questions, answers):
print('What is your {0}? It is {1}.'.format(q, a))
# 反向迭代
for i in reversed(['name', 'quest', 'favorite color']):
print(i)
# 迭代同时修改，使用a[:]隐藏copy一个新对象
words = ['cat', 'window', 'defenestrate']
for w in words[:]:
if len(w) > 6:
words.insert(0, w)
if __name__ == '__main__':
loop_demo()