Найти строку, которая начинается числом в диапазоне от 0 до 255

ip = range(255)
 
def get_file():
    with io.open("file", encoding='utf-8') as file:
           for line in file:
             if ip in line:
                print(line)

s = """
127.0.0.1 hello world
        212.421.511.522
999.999.999.99
python 231.21.52.16
test
""".split('\n')
 
for l in s:
    p = l.find('.')
    if p != -1 and l[:p].lstrip().isdigit() and 0 <= int(l[:p]) <= 255:
        print(l)

ip_range = list(range(255))
 
for line in open('pythonfile.txt'):
    new_line = line.split('.')
    try:
        int(new_line[0])
    except ValueError:
        continue
    if int(new_line[0]) in ip_range:
        print(line)

for line in open('pythonfile.txt'):
    new_line = line.strip().split('.')
    try:
        if  0 <= int(new_line[0]) <= 255:
            print(line)
    except: 
        pass

import string
 
 
def get_start_number(text):
    index = 0
    while text[index] in string.digits:
        index += 1
    return int(text[:index]) if index > 0 else -1
 
 
with open('test.txt') as file:
    for line in file.readlines():
        if 0 <= get_start_number(line) <= 255:
            print(line.strip())

import re
with open('mytimer.py') as file:
    for line in file.readlines():
        if re.match(r'^((\d{1,2}|1\d\d|2[0-5][0-5])\.){3}(\d{1,2}|1\d\d|2[0-5][0-5]).*', line):
            print(line.strip())

import re
with open('mytimer.py') as file:
    for line in file.readlines():
        if re.match(r'^((\d{1,2}|1\d\d|2[0-5][0-5])).*', line):
            print(line.strip())

import io
import socket
 
f = io.StringIO("""
127.0.0.1 hello world
bla-bla-bla
212.421.511.522
bla-bla-bla
999.999.999.99
231.21.52.16
bla-bla-bla
""")
 
# имитация чтения из файла
for line in f:
    try:
        ip = line.split()[0]
        socket.inet_aton(ip)
    except:
        pass
    else:
        print(line.strip())