fsum() returns sum of all elements of an iterable object in Python

fsum(iterable_object) returns the sum ( float data type ) of the elements of the iterable_object.

fsum(n) # (m,e)

iterable_object : Iterable Object like list, set, tuple , range etc

Returns floating point number.

Example using range

import math
print(math.fsum(range(0,10))) # 45.0

Example using list

import math
my_list=[1,2,3,4,5]
print(math.fsum(my_list)) # 15.0

Example using tuple

import math
my_tuple=(1.3,4.5,6.2,7.1)
print(math.fsum(my_tuple)) # 19.1

Example using using set

import math
my_set={1.3,4.5,6.2,7.1}
print(math.fsum(my_set))

We can use only iterable object

import math
my_data=5
print(math.fsum(my_data))

This will generate Error message

 TypeError: 'int' object is not iterable

Data type of output

We will get float dtype out put by using fsum()

import math
print(type(math.fsum([4,6,1])))   # <class 'float'>
print(type(math.fsum([1.4,6,1]))) # <class 'float'>

Difference between fsum() and sum()

fsum() is included in Python math module so we have to import it before using. Where as sum() is part of built in functions of core Python so no need to import any library.

fsum() returns always float dtype. However sum() returns the same dtype of input number.

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Subhendu Mohapatra

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