Python | Get sum of tuples having same first value
Given a list of tuple, the task is to sum the tuples having same first value.
Examples:
Input: [(1, 13), (2, 190), (3, 82), (1, 12)] Output: [(1, 25), (2, 190), (3, 82)] Input: [(1, 13), (1, 190), (3, 25), (1, 12)] Output: [(1, 215), (3, 25)]
Let’s discuss the different ways we can do this task.
Method #1: Using map()
# Python code to get sum of tuples having same first value # Initialisation of list of tupleInput = [(1, 13), (1, 190), (3, 25), (1, 12)] d = {x:0 for x, _ in Input} for name, num in Input: d[name] += num # using mapOutput = list(map(tuple, d.items())) # printing outputprint(Output) |
Output:
[(1, 215), (3, 25)]
Method #2: Using defaultdict
# Python code to sum list of tuples having same first value # Importingfrom collections import defaultdict # Initialisation of list of tupleInput = [(2, 190), (1, 13), (1, 12), (2, 14), (3, 82), (1, 70)] # Initialisation of defaultdictoutput = defaultdict(int) for k, v in Input: output[k] += v # Printing outputprint(list(output.items())) |
Output:
[(1, 95), (2, 204), (3, 82)]
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