How to judge a string in Python

Today, I will talk to you about how to judge a string in Python. Many people may not know much about it. In order to make you understand better, the editor has summarized the following content for you. I hope you can get something according to this article.

S.isalnum () all characters are numbers or letters

S.isalpha () all characters are letters

All characters in s.isdigit () are numbers

S.islower () all characters are lowercase

All characters in s.isupper () are uppercase

S.istitle () all words are capitalized, like headlines

S.isspace () all characters are blank characters,\ t,\ n,\ r

S1 = '1234'

S2 = '1234abcd'

S3 = 'abcd'

S4 = 'abCD'

S5 = 'ABCD'print s1.isalnum () # True

Print s1.isalpha () # False

Print s1.isdigit () # True

Print s1.islower () # False

Print s1.isspace () # False

Print s1.istitle () # False

Print s1.isupper () # False

Print s2.isalnum () # True

Print s2.isalpha () # False

Print s2.isdigit () # False

Print s2.islower () # True

Print s2.isspace () # False

Print s2.istitle () # False

Print s2.isupper () # False

Print s3.isalnum () # True

Print s3.isalpha () # True

Print s3.isdigit () # False

Print s3.islower () # True

Print s3.isspace () # False

Print s3.istitle () # False

Print s3.isupper () # False

Print s4.isalnum () # True

Print s4.isalpha () # True

Print s4.isdigit () # False

Print s4.islower () # False

Print s4.isspace () # False

Print s4.istitle () # False

Print s4.isupper () # Falseprint s5.isalnum () # True

Print s5.isalpha () # True

Print s5.isdigit () # False

Print s5.islower () # False

Print s5.isspace () # False

Print s5.istitle () # False

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