Regexp Basics - is it a letter?

Description:

Complete the code which should return true if the given object is a single ASCII letter (lower or upper case), false otherwise.

 

 

Solution:

1. Get the ASCII code of the argument.
2. Check whether the obtained ASCII code corresponds to the alphabet.
3. True if true, false otherwise.

 

def is_letter(s):
    ascii_num = len(s) == 1 and ord(s) 
    return (ascii_num >= 65 and ascii_num <= 90) or (ascii_num >= 97 and ascii_num <= 122

 

 

Bast Practice:

def is_letter(s):
    return len(s) == 1 and s.isalpha()

In Python, using isalpha(), you can check whether an alphabet is an alphabet without ASCII code.