# Python fsum

The Python fsum math function is used to calculate and return the sum of iterates (Tuples and Lists). In this section, we show how to use fsum function in Python with example.

The syntax of the math fsum Function in Python Programming Language is

`math.fsum(Iterators);`

Number: It can be a number or a valid numerical expression.

• If the number argument is a positive or negative number, the fsum function calculates and returns the sum of iterated (Tuples and Lists).
• If the number argument is not a number, fsum function return TypeError.

## Python fsum Function Example

The Python fsum function calculates and returns the sum of iterates. In this Python example, we are going to return the sum of iterates for different data types and display the output.

```# Python fsum Function

import math

Tup = (10, 20, 12, -40 , 50) # Tuple Declaration
Lis = [-98, 32, -39, -42 , 15] # List Declaration

print('Calculating SUM of Tuple Item = %.2f' %math.fsum(Tup))
print('Calculating SUM of Tuple Item = %.2f' %math.fsum(Lis))

print('Calculating SUM of Tuple Items Directly = %.2f' %math.fsum((1, 2, 3, 4, 5)))
print('Calculating SUM of List Items Directly = %.2f' %math.fsum([10, 20, 30, 40]))

print('SUM of Decimal Tuple Items Directly = %.2f' %math.fsum((1.25, 2.45, 3.2, 4, 5.95)))
print('SUM of Decimal List Items Directly = %.2f' %math.fsum([2.45, 20.24, 3.95, 4.59]))

print('SUM of List of String Items Directly = %.2f' %math.fsum(['a', 'b', 'c', 'd']))```
1. Within the first two statements, We used the Python Tuple and Python List items as the arguments for fsum Function. If you observe the above screenshot, the fsum function is working perfectly on them.
2. Within the next two statements, we passed the Positive integer Tuples and Lists as the fsum Function argument. From the above screenshot, see that the fsum Function is returning output.
3. Within the next two statements, we passed both the Positive and negative decimal Tuples and Lists as the fsum Function arguments. As we said before, the fsum Function is returning the output.
4. Last, We tried fsum Math function on List of String values. As we said before, Python returns TypeError as output.