'''
Documentation BUG:
documentation mentions hostmask attribute of IPv4Network
class returns a `string`, but in actual it is
returning the object of class IPv4Address

URL to official doc:
https://docs.python.org/3/library/ipaddress.html#ipaddress.IPv4Network.hostmask

code showing the actual result:
'''

import ipaddress as ip
ip1 = ip.IPv4Network('192.168.1.0')
rv = ip1.hostmask
print(type(rv))  # prints: <class 'ipaddress.IPv4Address'>

# which is not a string!
# assert isinstance(rv, str)  # should be True as per Documentation
assert isinstance(rv, ip.IPv4Address)