I had a nested dict in my project, which was printed via PrettyPrint (just throw the nested dict into it).
But this nested dict had to be replaced by nested MutableMapping Objects, because I needed to overwrite some MagicMethods. But because it's an object now, it is just taking the first key and prints out, that the value is a my_dict object.
How can I PrettyPrint now such a MutableMapping Object with a dict attribute?
class my_dict(collections.abc.MutableMapping):
def __init__(self):
print("dict was created")
self.d = dict() # var where I want to store my key/values
def __setitem__(self, key, value):
# do sth else
print("Dict Element was set: Key:\t{}, Value:\t{}".format(key, value))
self.d[key] = value
return
def __getitem__(self, key):
# do sth else
print("Item was requested")
return self.d[key]
def __delitem__(self, key):
del self.d[key]
def __iter__(self):
return self.d.__iter__()
def __len__(self):
return len(self.d)
def sd(self, k, d):
if k not in self:
self[k] = d
return self[k]
I'm using Python 3.6.
pprint just formats the string returned by __repr__, and prints it.
Add the following dunder method to your class.
def __repr__(self):
return self.d.__repr__()
Edited
from pprint import PrettyPrinter
PrettyPrinter._dispatch[my_dict.__repr__] = PrettyPrinter._pprint_dict
pprint will print as though it was called with the inner dict self.d. PrettyPrinter has an internal dict called _dispatch which maps class.__repr__ => pprint_method. So you have to add a pprint method for your class. In this case, I mapped my_dict.__repr__ to the pprint method for dict, so pprint formats my_dict objects as if they were dicts.
pprint source code is in plain python here.