Python 练习实例17

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题目:输入一行字符,分别统计出其中英文字母、空格、数字和其它字符的个数。

程序分析:利用 while 或 for 语句,条件为输入的字符不为 '\n'。

实例 - 使用 while 循环

#!/usr/bin/python # -*- coding: UTF-8 -*- import string s = raw_input('请输入一个字符串:\n') letters = 0 space = 0 digit = 0 others = 0 i=0 while i < len(s): c = s[i] i += 1 if c.isalpha(): letters += 1 elif c.isspace(): space += 1 elif c.isdigit(): digit += 1 else: others += 1 print 'char = %d,space = %d,digit = %d,others = %d' % (letters,space,digit,others)

实例 - 使用 for 循环

#!/usr/bin/python # -*- coding: UTF-8 -*- import string s = raw_input('请输入一个字符串:\n') letters = 0 space = 0 digit = 0 others = 0 for c in s: if c.isalpha(): letters += 1 elif c.isspace(): space += 1 elif c.isdigit(): digit += 1 else: others += 1 print 'char = %d,space = %d,digit = %d,others = %d' % (letters,space,digit,others)

以上实例输出结果为:

请输入一个字符串:
123runoobc  kdf235*(dfl
char = 13,space = 2,digit = 6,others = 2

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