Python determines whether a string is a letter or a number

Source: Internet
Author: User

Strict parsing: There are symbols except numbers or letters (spaces, semicolons, etc) will be false
Isalnum () must be a mix of numbers and letters
Isalpha () is case insensitive
str_1 ="123"str_2="ABC"str_3="123ABC"#Use the IsDigit function to determine whether a numberPrint(Str_1.isdigit ()) TurePrint(Str_2.isdigit ()) FalsePrint(Str_3.isdigit ()) False#use Isalpha to determine if the letterPrint(Str_1.isalpha ()) FalsePrint(Str_2.isalpha ()) TurePrint(Str_3.isalpha ()) False#Isalnum judge whether a combination of numbers and lettersPrint(Str_1.isalpha ()) FalsePrint(Str_2.isalpha ()) FalsePrint(Str_1.isalpha ()) Ture

Python determines whether a string is a letter or a number

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.