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-> To : mcu13321

the time complexity is bad in both cases...

For simplicity only. In real use it is obvious to use .lower() method. Even additional checks for digits and special charasters.

How does it even work ? Makes on sense
Please Explain what is special about 10

is there a reason why you didn't use .lower() function ?

Agreed. This method is fine but I always find myself messing up with whitespaces and punctuation

Damn, no need to compare their value from 5, if 1 then it will give 0 and if 9 then 1, and their are only 10 nums then damn and you don't need to import and use str(replaced string, now string is used for a different purpose)

Nice... :()

\d+ and [0-9]+ are patters, \d+ is just a more clean and good

Adding () will improve to read what is happening but, clever just genearte with X in middle

This is a clean code, easily expndable and aesily readable

Why convert string to string ????

Perfection