import re
def change_char(s, p, r): return s[:p] + r + s[p + 1:]
def parse_phone_number(text): numbers = re.findall(r"\d+", text)
if numbers is None:
return None
res = re.search(r"([87])([7])\d{9}|([7])\d{9}", ''.join(numbers))
if res is None:
return None
phone_number = res.group()
if phone_number[0] == "8":
phone_number = change_char(phone_number, 0, "7")
if len(phone_number) == 10:
phone_number = "7{0}".format(phone_number)
return int(phone_number)
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