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annotate python/mutable_defaults.py @ 694:ebca6d85213a

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File "/usr/lib/python3/dist-packages/IPython/config/__init__.py", line 16, in <module> from .application import * File "/usr/lib/python3/dist-packages/IPython/config/application.py", line 31, in <module> from IPython.config.configurable import SingletonConfigurable File "/usr/lib/python3/dist-packages/IPython/config/configurable.py", line 33, in <module> from IPython.utils.text import indent, wrap_paragraphs File "/usr/lib/python3/dist-packages/IPython/utils/text.py", line 28, in <module> from IPython.external.path import path File "/usr/lib/python3/dist-packages/IPython/external/path/__init__.py", line 2, in <module> from path import * File "/home/jhammel/python/path.py", line 25 print root(path) ^
author Jeff Hammel <k0scist@gmail.com>
date Wed, 09 Jul 2014 16:26:49 -0700
parents 434c65593612
children
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1 #!/usr/bin/env python
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2
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3 # see also: http://www.daniweb.com/software-development/python/threads/66697
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4
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5 class Foo(object):
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6 def __init__(self, mutable=['default']):
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7 self.foo = mutable
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8 self.foo.append(1)
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9
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10 if __name__ == '__main__':
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11 bar = Foo()
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12 print len(bar.foo)
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13 fleem = Foo()
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14 print len(fleem.foo)
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15 assert len(fleem.foo) == 2, "Don't use default mutable arguments!"