﻿ Python: Add two given lists of different lengths, start from right, use itertools module - w3resource

Python: Add two given lists of different lengths, start from right, use itertools module

Python Itertools: Exercise-36 with Solution

Write a Python program to add two given lists of different lengths, starting from the right, using the itertools module.

Sample Solution:

Python Code:

``````from itertools import zip_longest

def elementswise_right_join(l1, l2):
result = [a + b for a,b in zip_longest(reversed(l1), reversed(l2), fillvalue=0)][::-1]
return result

nums1 = [2, 4, 7, 0, 5, 8]
nums2 = [3, 3, -1, 7]
print("\nOriginal lists:")
print(nums1)
print(nums2)
print("\nAdd said two lists from right:")
print(elementswise_right_join(nums1, nums2))

nums3 = [1, 2, 3, 4, 5, 6]
nums4 = [2, 4, -3]
print("\nOriginal lists:")
print(nums3)
print(nums4)
print("\nAdd said two lists from right:")
print(elementswise_right_join(nums3, nums4))
```
```

Sample Output:

```Original lists:
[2, 4, 7, 0, 5, 8]
[3, 3, -1, 7]

Add said two lists from right:
[2, 4, 10, 3, 4, 15]

Original lists:
[1, 2, 3, 4, 5, 6]
[2, 4, -3]

Add said two lists from right:
[1, 2, 3, 6, 9, 3]
```

Python Code Editor:

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Next: Write a Python program to add two given lists of different lengths, start from left, 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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