import fileinput
import itertools
import re
import sys
index = 2 # index to delete
file = fileinput.input(inplace='--inplace' in sys.argv)
for line in file:
if line.startswith('1.' + str(index)):
break
print(line, end='')
# fix numeration
replace = lambda m, i=itertools.count(index): m.group(1)+str(next(i))
for line in file:
print(re.sub(r'(^1\.)\d+', replace, line), end='')
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MS4xLiDQn9GD0L3QutGCINC/0LXRgNCy0YvQuSwg0YLQtdC60YHRgi4KMS4yLiDQn9GD0L3QutGCINCy0YLQvtGA0L7QuSwg0LrQvtGC0L7RgNGL0Lkg0LHRg9C00LXRgiDQv9C+0LvQvdC+0YHRgtGM0Y4g0YPQtNCw0LvQtdC9LgoxLjMuINCf0YPQvdC60YIg0YLRgNC10YLQuNC5LCDRgtC10LrRgdGCLg==
1.1. Пункт первый, текст.
1.2. Пункт второй, который будет полностью удален.
1.3. Пункт третий, текст.