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Python Challenges: Each element at index i of an array is the product of all the numbers of a given array except the one at i

Python Challenges - 1: Exercise-54 with Solution

Write a Python program to create a new array such that each element at index i of the new array is the product of all the numbers of a given array of integers except the one at i.
Input: [10, 20, 30, 40, 50]
Output: [1200000, 600000, 400000, 300000, 240000]
Input: [1, 2, 0, 4]
Output: [0, 0, 8, 0]

Sample Solution:

Python Code:

def product(nums):
    new_nums = []

    for i in nums:
        nums_product = 1

        for j in nums:     
            if j != i:
                nums_product = nums_product * j
        new_nums.append(nums_product)

    return new_nums

print(product([10, 20, 30, 40, 50]))
print(product([1, 2, 0, 4]))
print(product([1, 2, 3, -4]))

Sample Output:

[1200000, 600000, 400000, 300000, 240000]
[0, 0, 8, 0]
[-24, -12, -8, 6]

Flowchart:

Python Flowchart: Each element at index i of an array is the product of all the numbers of a given array except the one at i.

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