How to defer pretty printing to builtin pprint?

[saulshanabrook]

I have a custom class and would like IPython to use pprint when converting it to pretty text, since I have already defined the pretty print implementation of my class.

I am able to do this by overriding _repr_pretty to defer to pprint, like this:

matchpy.Operation._repr_pretty_ = lambda self, pp, cycle: pp.text(pprint.pformat(self))

However, then the output is not aligned properly, since Python's pprint doesn't know we are already indented. Here is an example, where Function should be indented more:

('/Users/saul/p/uarray/uarray/uarray/numpy.py:320',
 'Calling %s(*%s, **%s)',
 (<function __main__.some_fn(a, b)>,
  [ArrayLike(Sequence(Value('10000'),
                   Function(Scalar(Content(Call(Content(NumpyNDArray('array([   0,    1,    2, ..., 9997, 9998, 9999])')),
                                                Unbound('', variable_name=i0)))),
                            Unbound('', variable_name=i0)))),
   ArrayLike(Sequence(Value('10000'),
                   Function(Scalar(Content(Call(Content(NumpyNDArray('array([   0,    1,    2, ..., 9997, 9998, 9999])')),
                                                Unbound('', variable_name=i1)))),
                            Unbound('', variable_name=i1))))],
  {}))

Does anyone either have a tip on how to indent this properly or a way to more seamlessly integrate IPython's pprinting with Python's own pprint module?

[Carreau]

I don't have any answer on that, pretty_print is relatively rarely used, and not the best API imho.

My take would be in your _repr_pretty_ to intercept the pp argument and try to implement a kind-of "dedent" functionality.

Not sure how easy it would be.