IPython ignores object's
I have written a subclass of defaultdict , and I gave it its own __repr__ method in order to customize its look in an interactive session.
In a regular Python session this works as expected:
Python 3.5.0 (default, Sep 20 2015, 11:28:25)
[GCC 5.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from collections import defaultdict
>>> class Foo(defaultdict):
... def __repr__(self):
... return 'foo_repr'
...
>>> foo = Foo()
>>> foo
foo_repr
... but in IPython it doesn't:
In [1]: from collections import defaultdict
In [2]: class Foo(defaultdict):
...: def __repr__(self):
...: return 'foo_repr'
...:
In [3]: foo = Foo()
In [4]: foo
Out[4]: defaultdict(None, {})
In [5]: repr(foo), str(foo)
Out[5]: ('foo_repr', 'foo_repr')
What is IPython doing here and how can I stop it?
EDIT: defining _repr_pretty_ helps:
In [1]: from collections import defaultdict
In [2]: class Foo(defaultdict):
def __repr__(self):
return 'foo_repr'
def _repr_pretty_(self, p, cycle):
p.text('repr_foo_pretty')
...:
In [3]: foo = Foo()
In [4]: foo
Out[4]: repr_foo_pretty
But I still don't quite understand what's going on. Obviously, _repr_pretty was not defined before on any of the base classes. How does IPython come to using the defaultdict 's __repr__ instead of Foo 's and why does it happen with defaultdict and not many others?
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