Determining whether the string only python3 digital (isdigit () method, isnumeric () method)

Isdigit () method

- detecting whether a string consisting only of numbers

　　grammar:

　　　　　　 1 str.isdigit ()

　　parameter:

• • • no

　　return value:

　　　　　　If the string contains only a number, the return True, otherwise False.

　　Example:

　　　　　　The following example shows an example isdigit () method:

1 str = '123456'
2 print(str.isdigit())    #True
3 
4 str = "耿雨飞"
5 print(str.isdigit())    #False