sim3x

clean_list = []
with open('input.txt', 'r', encoding="utf-8") as f_input:
    for l in f_input:
        if not l.startswith('http'):
            clean_list.append(l)

with open('input.txt', 'w', encoding="utf-8") as f_out:
    f_out.write('\n'.join(clean_list))

tuu = {'chat': []}
....
tuu[chat].append(a)