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, start from right , using 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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Python: Tips of the Day
Find current directory and file's directory:
To get the full path to the directory a Python file is contained in, write this in that file:
import os dir_path = os.path.dirname(os.path.realpath(__file__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)
To get the current working directory use
import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
- os.getcwd() (returns "a string representing the current working directory")
- os.chdir(path) ("change the current working directory to path")
Ref: https://bit.ly/3fy0R6m
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