Python基础学习笔记（四）语句

#!/usr/bin/python
# -*- coding: UTF-8 -*-
# 例2：elif用法

num = 5     
if num >= 0 and num <= 1:    # 判断值是否在0~1之间
    print ‘0~1之间‘        
elif num == 2:
    print ‘2‘
elif num == 3:
    print ‘3‘
elif num == 4:
    print ‘4‘
else:
    print ‘Invalid value‘     # 条件均不成立时输出

while 1:          # 循环条件为1必定成立
    print i         # 输出1~10
    i += 1
    if i > 10:     # 当i大于10时跳出循环
        break

#!/usr/bin/python
# -*- coding: UTF-8 -*-

fruits = [‘banana‘, ‘apple‘,  ‘mango‘]
for fruit in fruits:        # 第一个实例
   print ‘当前字母 :‘, fruit

#!/usr/bin/python
# -*- coding: UTF-8 -*-

for letter in ‘Python‘:     # 第一个实例
   if letter == ‘h‘:
      continue
   print ‘当前字母 :‘, letter

var = 10                    # 第二个实例
while var > 0:              
   var = var -1
   if var == 5:
      continue
   print ‘当前变量值 :‘, var

#!/usr/bin/python
# -*- coding: UTF-8 -*- 

# 输出 Python 的每个字母
for letter in ‘Python‘:
   if letter == ‘h‘:
      pass
      print ‘这是 pass 块‘
   print ‘当前字母 :‘, letter