Question

class idDict(dict):
    def __getattr__(self,key):
        return 'dsaads'
d=idDict()
print d['ss']

I just get an error: KeyError: 'ss'. According to some online forums, this should work.
I want to print out ‘dsaads’

This doesn’t work either; I get the same error:

from collections import defaultdict
class idDict(defaultdict):
    def __getattr__(self,key):
        return 'dsaads'
d=idDict()
print d['ss']

Answer 1

use __getitem__:

>>> class idDict(dict):
    def __getitem__(self,key):
        return 'dsaads'

>>> d=idDict()
>>> d['a']
'dsaads'

>>> help(dict.__getitem__)

Help on method_descriptor:

__getitem__(...)
    x.__getitem__(y) <==> x[y]