![]() ![]() Also dont name your variable list, that will cause problems. This will ensure only unique values are kept. Stay tuned for more informative articles. You can iterate through the dictionaries in your list, and then the key-value pairs in your dictionaries to push the values into a defaultdict of type set. We can also write the programs used in this article with exception handling using python try except to make the programs more robust and handle errors in a systematic way. How to Merge Two Dictionaries in Python Using the Double Asterisk Operator ( ) You can use the double asterisk (also called double star) operator ( ) to 'unpack' and merge the key and value pairs of two or more dictionaries into a variable. ![]() In this article, we have seen how to merge dictionaries in python using different methods. In this method too, when the dictionaries to be merged have common keys, the values for the respective keys will be taken from the dictionaries which come last in the sequence while merging. Also, none of the original dictionaries which have to be merged are modified. We can merge any number of dictionaries at once using ** operator. ![]() To merge the dictionaries, we will pop the items from a dictionary using the popitem() method and will keep adding it to another dictionary. When invoked on a dictionary the popitem() method deletes the most recently added item in the dictionary and returns the item in the form of a tuple as key value pair. The popitem() method is used to delete an item from a python dictionary. Merge dictionaries using popitem() method. On each iteration, use the dict.get() method to sum the values. Also only the first dictionary, to which the items are being added gets modified and nothing happens to the second dictionary. Use a dict comprehension to iterate over one of the dictionaries. While using the above method, we have to consider the point that if there are common keys between the two dictionaries, the final dictionary will have common keys with values from the second dictionary from which we have extracted the items. ![]()
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