problem with special built-in method __contains__,

eboy98 at eboy98 at
Tue Oct 2 13:14:38 CEST 2007

if i have a dictionary  name number ....and i want to    ask the list
whether a particular key already

>>> print number
{'octal': '1234567', 'binary': '10100101', 'decimal': '1234567890',
'hexadecimal': '1-9,a-f'}

 i got  error..after execute


Traceback (most recent call last):
  File "<pyshell#15>", line 1, in <module>
AttributeError: 'dict' object has no attribute '_contains_'

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