S = 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(letters,space,digit,others)
判断字符串字母,数字,下划线出现的次数
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转载自blog.csdn.net/qwertyuiopasdfgg/article/details/89980406
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