[Python-Dev] PEP 3144: IP Address Manipulation Library for the Python Standard Library

Nick Coghlan ncoghlan at gmail.com
Sat Aug 22 01:08:05 CEST 2009

Peter Moody wrote:
 this is a good idea and I'll implement this.  .iterhosts() for subnet
> - (network|broadcast) and .iterallhosts() for the entire subnet (in my
> testing, looping over an iterator was actually reasonably faster than
> just for i in IP(network):, so I'll support iterators for both)

I would suggest just changing __iter__ to be the equivalent of the
current iterhosts() and then changing iterhosts() as described.

Such a change would would also fix the thread safety and nested
iteration problems problems suffered by the current __iter__
implementation. I haven't executed the following, but from reading the
code I am confident they would behave as a I describe in the comments:

  # With the current implementation, this is an infinite loop
  net = IPv4Network("")
  for x in net:
  # And this only runs the inner loop once
  for x in net:
    for y in net:


Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia

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