Amit Dor-Shifer wrote:
> Hi all.
>
> I'd like to print-out a dictionary of objects. The printed values are
> references. How Do I print the actual objects.
>
> class MyClass:
> def __str__(self):
> return str(self.__dict__)
>
> if __name__ == '__main__':
> dict = dict()
> classA = MyClass()
> setattr(classA, "attr-1", "val-1")
>
> dict['a']= classA
> print classA
> ''' Desired output: {'attr-1': 'val-1'}'''
> print dict
> ''' Actual output: {'a': <__main__.MyClass instance at 0x79cfc8>}'''
>
> Thanks,
> Amit
Hi Amit,
You should add a __repr__ method to your class. This method is called
when you print an instance of the class; in the absence of a __repr__
method, the default representation is printed: <__main__.MyClass
instance at 0x...>
For example:
class MyClass:
def __str__(self):
return str(self.__dict__)
def __repr__(self):
return str(self)
The difference between the __str__ and __repr__ methods is that
__str__ is for conversion of an instance to a string, while __repr__
should return a human-readable representation of the instance, usually
used by developers for debugging etc. Sometimes these are the same but
not always, check out collections.defaultdict for an example.
For more information see:
http://docs.python.org/reference/datamodel.html#object.__repr__
- Tal
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