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Python: Compute the sum of non-zero groups (separated by zeros) of a given list of numbers

Python List: Exercise - 210 with Solution

Write a Python program to compute the sum of non-zero groups (separated by zeros) of a given list of numbers.

Sample Solution:

Python Code:

def test(lst):
    result = []
    ele_val = 0
    for digit in lst:
        if digit == 0:
            if ele_val != 0:
                result.append(ele_val)
                ele_val = 0
        else:
            ele_val += digit 
    if ele_val>0:
        result.append(ele_val) 
    return result
nums = [3,4,6,2,0,0,0,0,0,0,6,7,6,9,10,0,0,0,0,0,7,4,4,0,0,0,0,0,0,5,3,2,9,7,1,0,0,0]
print("\nOriginal list:")
print(nums)
print("\nCompute the sum of non-zero groups (separated by zeros) of the said list of numbers:")
print(test(nums))

Sample Output:

Original list:
[3, 4, 6, 2, 0, 0, 0, 0, 0, 0, 6, 7, 6, 9, 10, 0, 0, 0, 0, 0, 7, 4, 4, 0, 0, 0, 0, 0, 0, 5, 3, 2, 9, 7, 1, 0, 0, 0]

Compute the sum of non-zero groups (separated by zeros) of the said list of numbers:
[15, 38, 15, 27]

Flowchart:

Flowchart: Compute the sum of non-zero groups (separated by zeros) of a given list of numbers.

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Previous: Write a Python program to count the number of groups of non-zero numbers separated by zeros of a given list of numbers.
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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