Script to flip HTML-like tables upside down

table-flip.py

#
# Helper script to flip HTML-like tables with tbody tags upside down
#
# MIT License
# Copyright (c) 2018 Andrei Rybak
#

def pretty_print_tr(a_tr):
    return ''.join(a_tr)

with open('input.txt') as f:
    lines = f.readlines()

table_started = False
table_ended = False

pre_table = []
post_table = []
table = []
one_tr = []
for line in lines:
    if '<tbody' in line:
        table_started = True
        pre_table.append(line)
        continue
    if '</tbody' in line:
        table_ended = True
        post_table.append(line)
        continue
    if not table_started:
        pre_table.append(line)
        continue
    if table_ended:
        post_table.append(line)
        continue

    one_tr.append(line)
    if '</tr' in line:
        table.append(one_tr)
        one_tr = []

table = list(map(pretty_print_tr, reversed(table)))

with open('output.txt', 'w') as f:
    f.write(''.join(pre_table))
    f.write(''.join(table))
    f.write(''.join(post_table))