Answer 1

A key is a small piece of metal that is fashioned with notches for a specific lock. In other words, a key grants access to what is locked.

In python, a key is a value in a dictionary. To access data in a dictionary you need to provide the dictonary name along with it's key in square brackets:

data = {'a': 1, 'b': 2, 'c': 3}
print(data['b'])

#output
2