方法isalpha()判断是否英文字母;
方法isspace()判断是否空格;
方法isdigit()判断是否为数字。
#coding:utf-8
import string
s = raw_input('input a string:\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)