I would like to limit the input how can I do it?

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I would like to limit the input. The user can enter a letter (a-h) and an integer (1-8) for example c4 (chess board) How can I do it?
This is my code:

What I have tried:

square  = input("Enter a chess square identifier : ") 

if (ord(square[0]))%2 != int(square [1])%2:

    print("white")
else:
    print( "black")

Posted 3-Sep-21 6:47am

Member 15346181

Updated 3-Sep-21 9:40am

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Wendelius · Answer 1 · 2021-09-03T09:27:00

One way to validate the input is to use regular expression. Have a look at re — Regular expression operations — Python 3.9.7 documentation[^] and https://pythonspot.com/regular-expressions/[^]

What comes to the regular expression itself, you can read more from Regular-Expressions.info - Regex Tutorial, Examples and Reference - Regexp Patterns[^]. In this case the expression could look something like

^[a-h]{1}[1-8]{1}$

Just remember to use IGNORECASE with re.

Patrice T · Answer 2 · 2021-09-03T09:40:00

Quote:
I would like to limit the input. The user can enter a letter (a-h) and an integer (1-8) for example c4 (chess board) How can I do it?

smells like pattern matching. Ever thought of Regular Expressions ?
this will match a letter followed with a digit: [abcdefgh][12345678]

Just a few interesting links to help building and debugging RegEx.
Here is a link to RegEx documentation:
perlre - perldoc.perl.org[^]
Here is links to tools to help build RegEx and debug them:
.NET Regex Tester - Regex Storm[^]
Expresso Regular Expression Tool[^]
RegExr: Learn, Build, & Test RegEx[^]
Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript[^]
This one show you the RegEx as a nice graph which is really helpful to understand what is doing a RegEx: Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.[^]
This site also show the Regex in a nice graph but can't test what match the RegEx: Regexper[^]

I would like to limit the input how can I do it?

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