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Python | Get sum of tuples having same first value
• Last Updated : 14 Feb, 2019

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 tuple``Input` `=` `[(``1``, ``13``), (``1``, ``190``), (``3``, ``25``), (``1``, ``12``)]`` ` `d ``=` `{x:``0` `for` `x, _ ``in` `Input``}`` ` `for` `name, num ``in` `Input``: d[name] ``+``=` `num`` ` `# using map``Output ``=` `list``(``map``(``tuple``, d.items()))`` ` `# printing output``print``(Output)`
Output:

```[(1, 215), (3, 25)]
```

Method #2: Using `defaultdict`

 `# Python code to sum list of tuples having same first value`` ` `# Importing``from` `collections ``import` `defaultdict`` ` `# Initialisation of list of tuple``Input` `=` `[(``2``, ``190``), (``1``, ``13``), (``1``, ``12``), ``         ``(``2``, ``14``), (``3``, ``82``), (``1``, ``70``)]`` ` `# Initialisation of defaultdict``output ``=` `defaultdict(``int``)`` ` `for` `k, v ``in` `Input``:``    ``output[k] ``+``=` `v`` ` `# Printing output``print``(``list``(output.items()))`
Output:
```[(1, 95), (2, 204), (3, 82)]
```

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