Python judgment string and case conversion

This article mainly introduces the Python judgement string and the case conversion method, the need for the small partner can refer to.

Judgment string

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S.isalnum () #所有字符都是数字或者字母 s.isalpha () #所有字符都是字母 s.isdigit () #所有字符都是数字 s.islower () #所有字符都是小写 s.isupper () #所有字符都是大写 S.istitle () #所有单词都是首字母大写, like the title S.isspace () #所有字符都是空白字符, T, n

Case conversion

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S.upper () #把所有字符中的小写字母转换成大写字母 s.lower () #把所有字符中的大写字母转换成小写字母 s.capitalize () #把第一个字母转化为大写字母, remaining lowercase s.title () # Converts the first letter of each word to uppercase, and the remaining lowercase

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