>>> int('0111011', 2)
59
>>> hex(int('0111011', 2))
'0x3b'
>>> hex(int('0111011', 2))[2:]
'3b'
>>>

  
>>> import re
>>> 
>>> def is_correct_ip(s):
...     pat = r'^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$'
...     if re.search(pat, s):
...         lst = map(int, s.split('.'))
...         return all(i <= 255 for i in lst)
...     return False
... 
>>> is_correct_ip('127.0.0.1')
True
>>> is_correct_ip('127.0.256.1')
False
>>> is_correct_ip('0000127.0.0.1')
False
>>>