Python: Add two given lists of different lengths, start from left, use itertools module
37. Add Lists from Left
Write a Python program to add two given lists of different lengths, starting from the left, using the itertools module.
Sample Solution:
Python Code:
from itertools import zip_longest
def elementswise_left_join(l1, l2):
result = [a + b for a,b in zip_longest(l1, 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 left:")
print(elementswise_left_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 left:")
print(elementswise_left_join(nums3, nums4))
Sample Output:
Original lists: [2, 4, 7, 0, 5, 8] [3, 3, -1, 7] Add said two lists from left: [5, 7, 6, 7, 5, 8] Original lists: [1, 2, 3, 4, 5, 6] [2, 4, -3] Add said two lists from left: [3, 6, 0, 4, 5, 6]
For more Practice: Solve these Related Problems:
- Write a Python program to add two lists of different lengths from the left side using itertools.zip_longest, padding with zero on the left.
- Write a Python program to sum corresponding elements from two lists starting from the left and then map a lambda to square each result.
- Write a Python program to use itertools.zip_longest to add two lists element-wise from the left and then filter out sums that are prime.
- Write a Python program to combine two lists of different lengths from the left side and then compute the cumulative sum of the results.
Python Code Editor:
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Next: Write a Python program to interleave multiple given lists of different lengths using itertools module.What is the difficulty level of this exercise?
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