Remove last digit from file

Question

Hi all. I have a file.

Sequence 1.1.1 ATGCGCGCGATAAGGCGCTA
ATATTATAGCGCGCGCGCGGATATATATATATATATATATT
Sequence 1.2.2 ATATGCGCGCGCGCGCGGCG
ACCCCGCGCGCGCGCGGCGCGATATATATATATATATATATT
Sequence 2.1.1 ATTCGCGCGAGTATAGCGGCG

NOW,I would like to remove the last digit from each of the line that starts with '>'. For example, in this first line, i would like to remove '.1' (rightmost) and in second instance i would like to remove '.2' and then write the rest of the file to a new file. Thanks,

Answer 1

import re

input_file = open('in')
output_file = open('out', 'w')

for line in input_file:
    line = re.sub(r'(\d+[.]\d+)[.]\d+', r'\1', line)
    output_file.write(line)