ANTICHAT — форум по информационной безопасности, OSINT и технологиям

#!/usr/bin/env python3

tmp = 1
 
with open(str(input("Enter file name: "))) as fin:
    with open("out.txt", "a") as fout:
        for line in fin:
            if line.strip():
                fout.write(line.strip() + ':') if tmp % 2 == 1 else fout.write(line)
                tmp += 1