# Python: Compute the sum of digits of each number of a given list of positive integers

## Python Itertools: Exercise-34 with Solution

Write a Python program to compute the sum of digits of each number in a given list of positive integers.

**Sample Solution:**

**Python Code:**

```
from itertools import chain
def sum_of_digits(nums):
return sum(int(y) for y in (chain(*[str(x) for x in nums])))
nums = [10,2,56]
print("Original tuple: ")
print(nums)
print("Sum of digits of each number of the said list of integers:")
print(sum_of_digits(nums))
nums = [10,20,4,5,70]
print("\nOriginal tuple: ")
print(nums)
print("Sum of digits of each number of the said list of integers:")
print(sum_of_digits(nums))
```

Sample Output:

Original tuple: [10, 2, 56] Sum of digits of each number of the said list of integers: 14 Original tuple: [10, 20, 4, 5, 70] Sum of digits of each number of the said list of integers: 19

**Python Code Editor:**

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**Next:**Write a Python program to get all possible combinations of the elements of a given list using itertools module.

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## Python: Tips of the Day

**Inverts a dictionary with non-unique hashable values:**

Example:

def tips_collect_dictionary(obj): inv_obj = {} for key, value in obj.items(): inv_obj.setdefault(value, list()).append(key) return inv_obj ages = { "Owen": 25, "Jhon": 25, "Pepe": 15, } print(tips_collect_dictionary(ages))

Output:

{25: ['Owen', 'Jhon'], 15: ['Pepe']}

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