>>> dic = {'a': ['1a','2a','3a'],'b': ['1b','2b'], 'a' : ['4a','5a']}
It has same keys 'a'
and I want to get all values from this dic
but when I use
>>> dic.get('a')
It only returns
['4a','5a']
How can I get all 'a' key's values from it?
I have thought to using repetitive statement to check all keys, but it seems inefficient
A dictionary can't store duplicate keys. One way around is to store lists or sets inside the dictionary. I'd recommend you to store values in a set pointing same keys.
>>> from collections import defaultdict
>>> dic = defaultdict(list)
>>> dic['a'].extend(['1a','2a','3a'])
>>> dic['a'].extend(['4a','5a'])
>>> dic['b'].extend(['1b','2b'])
You say:
>>> dic = {'a': ['1a','2a','3a'],'b': ['1b','2b'], 'a' : ['4a','5a']}
It has same keys 'a'
no it doesn't:
>>> dic = {'a': ['1a','2a','3a'],'b': ['1b','2b'], 'a' : ['4a','5a']}
>>> dic
{'a': ['4a', '5a'], 'b': ['1b', '2b']}
the first occurrence of key 'a' has simply disappeared, "trampled over" by the second occurrence of the same key.
I doubt you're building dic as a dict literal like this (I think such a literal should raise an exception, because it makes absolutely no sense, but, alas, it doesn't) -- can you show us the actual code you're using instead in order to build that dict? Then we might suggest how to actually build the dict you want!-)
Python dictionary doesn't support duplicate keys, check this thread for a solution to achive this, make dictionary with duplicate keys in python
