how to use multiple keys for single value in dictionary python

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1 from collections import defaultdict
2 data = [(2010, 2), (2009, 4), (1989, 8), (2009, 7)]
3 d = defaultdict(list)
4print (d) # output --> defaultdict(<type 'list'>, {})
5 for year, month in data:
6     d[year].append(month) 
7print (d) # output --> defaultdict(<type 'list'>, {2009: [4, 7], 2010: [2], 1989: [8]})

1#Python Dictionary only contain one key : one value pair.
2#You can surely have multiple keys having same value
3#Example :-
4  dict = {'a':'value1', 'b':'value2', 'c':'value 3'}
5#In above we have a and b key having same values

1No, each key in a dictionary should be unique. 
2You can’t have two keys with the same value. 
3Attempting to use the same key again will just overwrite the previous value stored. 
4If a key needs to store multiple values, 
5then the value associated with the key should be a list or another dictionary.
6Sourece: https://discuss.codecademy.com/t/can-a-dictionary-have-two-keys-of-the-same-value/351465

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