# HG changeset patch
# User Jeff Hammel <jhammel@mozilla.com>
# Date 1285083019 25200
# Node ID 70544c7406e2d14ba0f19104e1a2dae68c5ac853
# Parent  6d09c2a8e5e90625e85860565f437e695af46bc3
add illustration program for mutable arguments, since this comes up a bunch

diff -r 6d09c2a8e5e9 -r 70544c7406e2 python/mutable_defaults.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/python/mutable_defaults.py	Tue Sep 21 08:30:19 2010 -0700
@@ -0,0 +1,13 @@
+#!/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!"