What is the use of the "sum" function in Python?

Question

Jayant Kumar · Accepted Answer

Table of Contants
Introduction
The sum function in Python is a built-in utility used to calculate the total sum of numeric values within an iterable, such as a list or tuple. It is a straightforward and efficient way to aggregate numerical data, making it a valuable tool for various data manipulation and analysis tasks.

How the sum Function Works
The sum function computes the total by adding up all elements in an iterable. It can also take an optional second argument to specify a starting value for the sum.
Syntax:
sum(iterable, /, start=0)

**iterable**: The iterable containing numeric values to be summed.
**start** (optional): A value that is added to the sum of the iterable. The default is 0.

Example:
numbers = [1, 2, 3, 4, 5]
total = sum(numbers)

print(total)

Output:
15

In this example, sum calculates the total of the numbers in the list.

Using the start Parameter
The start parameter allows you to specify an initial value to add to the sum. This is useful when you need to include an additional value in the total.
Example:
numbers = [1, 2, 3, 4, 5]
total_with_start = sum(numbers, 10)

print(total_with_start)

Output:
25

Here, the sum of the list [1, 2, 3, 4, 5] is 15, and the start value of 10 is added to get a total of 25.

Practical Examples
1. Summing Elements in a List
values = [10, 20, 30, 40, 50]
total_sum = sum(values)

print(total_sum)

Output:
150

This example demonstrates summing all elements in a list of numbers.
2. Summing Elements in a Tuple
data = (5, 10, 15, 20)
total = sum(data)

print(total)

Output:
50

In this case, sum is used to calculate the total of numeric values in a tuple.
3. Including an Initial Value
prices = [100, 200, 300]
total_with_discount = sum(prices, -50)

print(total_with_discount)

Output
550

Here, sum calculates the total of 100 + 200 + 300 and includes an additional value of -50, resulting in 550.
4. Summing Values from a Generator Expression
total = sum(x ** 2 for x in range(1, 6))

print(total)

Output:
55

In this example, sum calculates the total of squares of numbers from 1 to 5, using a generator expression.

Conclusion
The sum function in Python is an essential tool for aggregating numeric values within an iterable. With its straightforward syntax and optional start parameter, it provides flexibility for various summation tasks. Whether you're working with lists, tuples, or generator expressions, understanding how to use sum effectively can streamline your data processing and enhance the efficiency of your Python programs.

What is the use of the "sum" function in Python?

Table of Contants

Introduction

How the `sum` Function Works

Syntax:

Example:

Using the `start` Parameter

Example:

Practical Examples

1. Summing Elements in a List

2. Summing Elements in a Tuple

3. Including an Initial Value

4. Summing Values from a Generator Expression

Conclusion

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