New submission from Hayden Clark :
If you make a user-defined type that inherits from typing.Mapping (which is an
alias for collections.abc.Mapping), pprint does not dump the contents, it just
treats it as an unknown class.
Examining the code, it is explicitly checking for "dict" type, even though it
is only reading the data.
Here is a reproduction:
from typing import Mapping
from pprint import pprint
class MyMap(Mapping):
def __init__(self, **kwargs) -> None:
self.data = {
k:v for k, v in kwargs.items()
}
def __getitem__(self, k):
return self.data.get(k)
def __len__(self):
return self.data.__len__()
def __iter__(self):
return self.data.__iter__()
info = MyMap(
foo="bar",
baz=MyMap(bar="foo")
)
pprint(info)
--
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<https://bugs.python.org/issue44580>
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