Python-сообщество

D = {'a': 1, 'b': 2, 'c': 3}
Ks = D.keys()
Ks.sort()
print(Ks)

['__and__', '__class__', '__contains__', '__delattr__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__ne__', '__new__', '__or__', '__rand__', '__reduce__', '__reduce_ex__', '__repr__', '__ror__', '__rsub__', '__rxor__', '__setattr__', '__sizeof__', '__str__', '__sub__', '__subclasshook__', '__xor__']

>>> D = {'a': 1, 'b': 2, 'c': 3}
>>> Ks = D.keys()
>>> type(Ks)
<class 'dict_keys'>

>>> D = {'a': 1, 'b': 2, 'c': 3}
>>> Ks = list(D.keys())
>>> Ks.sort()
>>> print(Ks)
['a', 'b', 'c']

D = {'a': 1, 'b': 2, 'c': 3}
Ks = D.keys()
print(sorted(Ks))