python 计算字符个数

题目：输入一行字符，分别统计出其中的英文字母、空格、数字和其它字符的个数

分析：利用while或for语句，条件为输入的字符不为’\n’

使用while循环

# -*- coding:utf-8 -*-

import string


s = 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))

使用for循环

# -*- coding:urf-8 -*-

import string
s = 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))

输出结果：

请输入一个字符串：
asd7868@!#ASD
char 6,space 0, digit 4, others 3