【python】判斷一個地址是ipv4還是ipv6

from netaddr.ip import IPAddress

def isIP4or6(cfgstr):
	ipFlg = False

	if '/' in cfgstr:
		text = cfgstr[:cfgstr.rfind('/')]
	else:
		text = cfgstr
	
	try:
		addr = IPAddress(text)
		ipFlg = True
	except:
		ipFlg = False

	if ipFlg == True:
		return addr.version
	else:
		return False
		
str_IPaddress = '192.168.1.2'
	
if isIP4or6(str_IPaddress) == 4:
	print('It is ipv4.')
elif isIP4or6(str_IPaddress) == 6:
	print('It is ipv6.')
else:
	print('It is neither ipv4 nor ipv6.')