sum() function in Python

The sum of numbers in the list is required everywhere. Python provides an inbuilt function sum() which sums up the numbers in the list. 

Example

In the given example, we have created a list of numbers and we calculate the sum with the start pointer and without the start pointer in with the sum() in Python.

Output:

25
35

Sum() Function in Python Syntax 

Syntax : sum(iterable, start)  

• iterable : iterable can be anything list , tuples or dictionaries , but most importantly it should be numbers.
• start : this start is added to the sum of  numbers in the iterable. If start is not given in the syntax , it is assumed to be 0.

Possible two more syntaxes

sum(a) :  a is the list , it adds up all the numbers in the list a and takes start to be 0, so returning only the sum of the numbers in the list.
sum(a, start) : this returns the sum of the list + start 

Python Sum() Function Examples

Python Sum Function on a Dictionary 

In this example, we are creating a tuple of 5 numbers and using sum() on the dictionary in Python.

Output :

60

Python Sum Function on a Set

In this example, we are creating a tuple of 5 numbers and using sum() on the set in Python.

Output :

15

Python Sum Function on a Tuple

In this example, we are creating a tuple of 5 numbers and using sum() on the tuple in Python.

Output :

15

Sum in Python with For Loop

In this, the code first defines a list of numbers. It then initializes a variable called total to 0. The code then iterates through the list using a for loop, and for each number in the list, it adds that number to the total variable. Finally, the code prints the value of the total, which is the sum of the numbers in the list.

Output :

The sum of the numbers is: 150

Error and Exceptions

TypeError

This error is raised in the case when there is anything other than numbers in the list. In the given example we are using a list of strings rather than an integer. 

Output :

Traceback (most recent call last):
  File "/home/23f0f6c9e022aa96d6c560a7eb4cf387.py", line 6, in 
    Sum = sum(arr)
TypeError: unsupported operand type(s) for +: 'int' and 'str'

Practical Application 

Problems where we require the sum to be calculated to do further operations such as finding out the average of numbers. 

Output :

3