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代码是从某开源项目中找到的，忘了出处，侵删。
def is_ip(value):
import sys, os, socket
PY2 = sys.version_info[0] == 2
"""Determine if the given string is an IP address.
Python 2 on Windows doesn't provide ``inet_pton``, so this only
checks IPv4 addresses in that environment.
:param value: value to check
:type value: str
:return: True if string is an IP address
:rtype: bool
"""
if PY2 and os.name == 'nt':
try:
socket.inet_aton(value)
return True
except socket.error:
return False
for family in (socket.AF_INET, socket.AF_INET6):
try:
socket.inet_pton(family, value)
except socket.error:
pass
else:
return True
return False
