view python/mutable_defaults.py @ 116:2a83052a7a50

add hg defaults from http://blog.bonardo.net/2010/06/22/so-youre-about-to-use-checkin-needed
author Jeff Hammel <jhammel@mozilla.com>
date Thu, 09 Dec 2010 14:49:14 -0800
parents 70544c7406e2
children 434c65593612
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#!/usr/bin/env python

class Foo(object):
  def __init__(self, mutable=['default']):
    self.foo = mutable
    self.foo.append(1)

if __name__ == '__main__':
  bar = Foo()
  print len(bar.foo)
  fleem = Foo()
  print len(fleem.foo)
  assert len(fleem.foo) == 2, "Don't use default mutable arguments!"