Convert Unicode "MATHEMATICAL SANS-SERIF ITALIC" letters to their ASCII equivalents

de_italicize.py

#!/usr/bin/env python3

# Use like this:
# cat file.txt | ./de_italicize.py

import sys

italic_lowercase_a = '𝘢'
italic_uppercase_a = '𝘈'

for line in sys.stdin:
    good_line = ""
    for c in line:
        if ord(c) in range(ord(italic_lowercase_a), ord(italic_lowercase_a)+26+1):
            good_line += chr(ord('a') + ord(c) - ord(italic_lowercase_a))
        elif ord(c) in range(ord(italic_uppercase_a), ord(italic_uppercase_a)+26+1):
            good_line += chr(ord('A') + ord(c) - ord(italic_uppercase_a))
        else:
            good_line += c
    print(good_line, end='')