How to Add Numbers in a List in Python Without Sum

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In this Python tutorial, we will see, how to add numbers in a list in Python without SUM.

We can add numbers in a Python list without sum by using below two methods.

  • Add numbers in a list python using for loop
  • add numbers in a list python using reduce() function

Add numbers in a list python using for loop

Let us see, how to add numbers in a list in Python without sum, by using for loop.

Create a function that is going to sum the numbers within the list using the below code.

def sum_list(list_num):
  sum = 0
  for num in list_num:
    sum +=num
  return sum

Create a list that contains the number of people who died in the top 5 states of the USA such as California = 96071, Texas = 90940, Florida = 81464, New York = 71499 and Pennsylvania = 47213.

usa_covid_death = [96071, 90940, 81464, 71899, 47213]

Pass the above list to sum the total number of people who died in these five states using the below code.

sum_list(usa_covid_death)
How to Add Numbers in a List Python Without Sum
How to Add Numbers in a List Python Without Sum

Read: How to find the sum of the list in Python

This is how to add numbers in list in Python using for loop.

Add numbers in a list python without sum by using reduce() function

Now, let us see, how to add numbers in a list python without sum by using reduce() function.

Applying a specific function to all of the list components indicated in the sequence sent along is what the reduce() function does. In the “functools” module, this function is defined.

First, import the required libraries and create a sum function using the below code.

import functools

def s_list(a,b):
  return a + b

Create a list that contains the number of people who died in the top 5 states of the USA such as California = 96071, Texas = 90940, Florida = 81464, New York = 71499 and Pennsylvania = 47213.

usa_covid_death = [96071, 90940, 81464, 71899, 47213]

Pass the created function “s_list()” and the list “usa_covid_death” to sum the numbers of that using the below code.

sum = functools.reduce(s_list,usa_covid_death)

Check the sum of the numbers of the list using the below code.

print(sum)
How to Add Numbers in a List Python Without Sum Using Reduce function
How to Add Numbers in a List Python Without Sum Using Reduce function

Read: Add two numbers in Python using the function

This is how to sum the numbers in a list in python without the sum function of Python.

We have covered how to sum the elements in the list python using the loop and the reduce function but without using SUM.

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