x.startswith()-----judging whether to start from [x], for example, whether the user enters the mobile phone number is 186:
Execute as follows
x.endswith()------judging whether it ends with 【x】
Execute as shown below
Combined judgment
x.isalpha()------Determine whether the string is all letters
Execute as shown below
x.isalnum()-----Determine whether the string is a letter or a number
Execute as shown below
x.isdigit()------Determine whether the number in the string is an integer
Execute as shown below
x.isidentifier()------judging whether the string is legal can be used as a variable name
Execute as shown below
x.islower()------Determine whether the string is all lowercase
Execute as shown below
x.isnumeric()---Judging the digital form in the string, different from isdigit can recognize various forms of numbers (such as Chinese, Roman numerals, etc.)
Execute as shown below
x.isprintable()----judging whether it can be printed
Execute as shown below
x.isspace()-----judging whether it is a space
Execute as shown below
x.istitle()-----judging whether the string is a title
Execute as shown below
x.isupper()-----judgment whether it is all uppercase
Execute as shown below
