view python/mutable_defaults.py @ 107:1da1baa03ac1

add a cli example program
author Jeff Hammel <jhammel@mozilla.com>
date Mon, 29 Nov 2010 07:21:30 -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!"