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Python | Sum values for each key in nested dictionary
• Last Updated : 14 May, 2020

Given a nested dictionary and we have to find sum of particular value in that nested dictionary. This is basically useful in cases where we are given a JSON object or we have scraped a particular page and we want to sum the value of a particular attribute in objects.

Code #1: Find sum of sharpness values using sum() function

 `# Python code to find sum values within nested dictionaries``weapons ``=` `{'``': None, '``sword``': { '``steel': ``151``,``                                ``'sharpness'``: ``100``,``                                ``'age'``: ``2``,},``                                 ` `                     ``'arrow'``: {``'steel'``: ``120``,``                               ``'sharpness'``: ``205``,``                               ``'age'``: ``1``,}}``                                ` `sumValue1 ``=` `sum``(d[``'sharpness'``] ``for` `d ``in` `weapons.values() ``if` `d)``sumValue2 ``=` `sum``(d[``'steel'``] ``for` `d ``in` `weapons.values() ``if` `d)`` ` `print``(sumValue1)``print``(sumValue2)`
Output:
```305
271
```

Code #2 : Using Iteration to convert it into key:value pair.

 `# Python code to find sum values within nested dictionaries`` ` `weapons ``=` `{'``': None, '``sword``': { '``steel': ``151``,``                                ``'sharpness'``: ``100``,``                                ``'age'``: ``2``,},``                                 ` `                     ``'arrow'``: {``'steel'``: ``120``,``                               ``'sharpness'``: ``205``,``                               ``'age'``: ``1``,}}``                                ` `sum` `=` `0`` ` `# iterating key value pair``for` `key ,value ``in` `weapons.items():`` ` `    ``if` `value ``and` `'sharpness'` `in` `value.keys():``        ``# Adding value of sharpness to sum``        ``sum` `+``=` `value[``'sharpness'``] `` ` `# printing sum``print``(``sum``)`
Output:
```305
```

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