On 29 September 2012 21:15, Albert-Jan Roskam <fo...@yahoo.com> wrote:
> Hi,
>
> I've written a __repr__ method that is supposed to *always* work. That is,
> it returns an eval-able text representation of any class instance.
> Will this really always work?
No.
> I'd find it useful is this is standard behavior of Python. Or am I
> overlooking something?
>
Yes.
>
>
> import inspect
>
> class X (object):
>
> def __init__(self, x=1, y='n'):
> self.x = x
> self.y = y
>
> def __repr__(self):
> code = self.__class__.__name__ + "("
> for arg in inspect.getargspec(self.__init__).args [1:] :
> if isinstance(eval("self." + arg), basestring):
>
I'd prefer getattr(self, arg) to eval("self." + arg).
> code += ("%(" + arg + ")r, ")
> else:
> code += ("%(" + arg + ")s, ")
> code = code[:-2] + ")"
> return code % self.__dict__
>
> x = X()
> eval(repr(x))
>
This repr method assumes that every argument to __init__ is stored as an
attribute with the same name as the parameter to __init__. Consider:
def __init__(self, name):
self.other_name = name
Also how do you handle:
def __init__(self, *args, **kwargs):
Oscar
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