# Python | Sum values for each key in nested dictionary

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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