[issue33784] hash collision in instances of ipaddress.ip_network

[Francois Schneider]

Francois Schneider  added the comment:

Thanks for the analysis, I agree completely.

Actually the problem was coming from my code where one of the __eq__ method was 
implemented like this:
>>> def __eq__(self, other):
>>>   return hash(self) == hash(other)

so 2 instances with only a slight difference in their ip_network attribute 
(ip_network(u'20.0.2.3/32') and ip_network(u'20.0.2.0/30')) were having the 
same hash and being equal -> they could not be inserted both in the same 
collection.

I will just rewrite my __eq__ method properly.

--
status: pending -> open

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[issue33784] hash collision in instances of ipaddress.ip_network

[Francois Schneider]

New submission from Francois Schneider :

>>> import ipaddress
>>> hash(ipaddress.ip_network(u'20.0.2.3/32')) == 
>>> hash(ipaddress.ip_network(u'20.0.2.0/30'))
True

--
components: Library (Lib)
messages: 318835
nosy: Francois Schneider
priority: normal
severity: normal
status: open
title: hash collision in instances of ipaddress.ip_network
type: behavior
versions: Python 2.7

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[issue33784] hash collision in instances of ipaddress.ip_network

[Francois Schneider]

Change by Francois Schneider :


--
versions: +Python 3.4, Python 3.5

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