Is there a way to auto generate a __str__() implementation in python?

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You can iterate instance attributes using vars, dir, …:

def auto_str(cls):
    def __str__(self):
        return '%s(%s)' % (
            type(self).__name__,
            ', '.join('%s=%s' % item for item in vars(self).items())
        )
    cls.__str__ = __str__
    return cls

@auto_str
class Foo(object):
    def __init__(self, value_1, value_2):
        self.attribute_1 = value_1
        self.attribute_2 = value_2

Applied:

>>> str(Foo('bar', 'ping'))
'Foo(attribute_2=ping, attribute_1=bar)'

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