I was working with namedtuples and learned something that I found odd at first. Still not quite sure how or why this works and what can be the use of this:
from collections import namedtuple
Card = namedtuple('Card', ['rank', 'suit'])
Above code works fine and creates a new Class - Card, which is a subclass of tuple class.
Now when I do this:
newCard = Card('7', 'Hearts')
It serves my purpose of creating a new card. But when I do this:
newCard = Card['7', 'Hearts']
It does not work as expected but also does not throw any error. Normally, Types are not subscriptable and if I try the same with any other class:
class FrenchDeck:
Pass
newDeck = FrenchDeck[1]
It throws following error:
Traceback (most recent call last):
File "C:\Users\sbvik\PycharmProjects\pythonProject\Chapter1.py", line 27, in <module>
c = FrenchDeck[1]
TypeError: 'type' object is not subscriptable
But if I inherit my FrenchDeck class like this:
class FrenchDeck(tuple):
Pass
newDeck = FrenchDeck[1]
No error is thrown.
Then I checked the type of newDeck it turns out to be <class 'types.GenericAlias'>
I am not sure what 'types.GenericAlias' means, what's its purpose and how is it used?
Also, why was TypeError: 'type' object is not subscriptable not thrown in this case?
