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I have two dictionaries that I want the union of so that each value from the first dictionary is kept and all the key:value pairs from the second dictionary is added to the new dictionary, without overriding the old entries.
dict1 = {'1': 1, '2': 1, '3': 1, '4': 1} dict2 = {'1': 3, '5': 0, '6': 0, '7': 0} where the function dictUnion(dict1, dict2) returns
{'1': 1, '2': 1, '3': 1, '4': 1, '5': 0, '6': 0, '7': 0} I can, and have done it by using simple loops, this is pretty slow though when operating on large dictionaries. A faster more "pythonic" way would be appreciated
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The simplest way to merge two dictionaries in python is by using the unpack operator(**). By applying the "**" operator to the dictionary, it expands its content being the collection of key-value pairs.
“Dict union will return a new dict consisting of the left operand merged with the right operand, each of which must be a dict (or an instance of a dict subclass). If a key appears in both operands, the last-seen value (i.e. that from the right-hand operand) wins.”
The straight answer is NO. You can not have duplicate keys in a dictionary in Python.
dict2.update(dict1) This keeps all values from dict1 (it overwrites the same keys in dict2 if they exist).
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