标签：html pytho cte href class types.h lower rip ica
一：str.isalnum() ，str.isalpha()，str.isdigit() ，str.islower() ，str.isupper()
1.str.isalnum()
This method checks if all the characters of a string are alphanumeric (a-z, A-Z and 0-9).
>>> print ‘ab123‘.isalnum() True >>> print ‘ab123#‘.isalnum() False
2.str.isalpha()
This method checks if all the characters of a string are alphabetical (a-z and A-Z).
>>> print ‘abcD‘.isalpha() True >>> print ‘abcd1‘.isalpha() False
3.str.isdigit()
This method checks if all the characters of a string are digits (0-9).
>>> print ‘1234‘.isdigit() True >>> print ‘123edsd‘.isdigit() False
4.str.islower()
This method checks if all the characters of a string are lowercase characters (a-z)
>>> print ‘abcd123#‘.islower() True >>> print ‘Abcd123#‘.islower() False
This method checks if all the characters of a string are uppercase characters (A-Z).
>>> print ‘ABCD123#‘.isupper() True >>> print ‘Abcd123#‘.isupper() False
标签：html pytho cte href class types.h lower rip ica
原文地址：https://www.cnblogs.com/Mr-l/p/10662270.html
