小练习---统计字符串

• 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。
• 利用 while 或 for 语句,条件为输入的字符不为 ' '。
• 实例

import string
s = raw_input('请输入一个字符串:
')
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)

• 结果

 I'm a monster 1wan 2he 3ying !!!   

 2 char = 19,space = 6,digit = 3,others = 4 

---

• 利用for循环实现
• 代码

import string
s = input("请输入一个字符串：
")
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))