#!/usr/bin/python
# -*- coding: utf-8 -*-
#Author: zhaosj

if None:
    print("Hello")

#执行结果：

None 为 False，所以没有任何输出

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#!/usr/bin/python
# -*- coding: utf-8 -*-
#Author: zhaosj

for i in [1, 0]:
    print(i+1)

Python 中，for 和 while 可以有 else 语句？

for 和 while 都可以有 else 语句

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#!/usr/bin/python
# -*- coding: utf-8 -*-
#Author: zhaosj

while 4 == 4:
    print('4')

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迭代输出序列时（如：列表）使用 for 比 while 更好？

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#!/usr/bin/python
# -*- coding: utf-8 -*-
#Author: zhaosj

for char in 'PYTHON STRING':
    if char == ' ':
        break

    print(char, end='')

    if char == 'O':
        continue

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