Aren’t you sure about Sum function Python? If yes, then this article will help you to a lot on how to use Sum() function in Python to get most out of it.

**Sum Function Python**

Python provides many inbuilt functions for doing frequent tasks to facilitate faster coding experience. One of them is to find the sum of the elements of an iterable.

It can be done using a user defined function, but it seems a hassle to write a function yourself. Moreover, when multiple types of iterables are involved, it becomes a tedious task to make separate functions for all of them. Luckily Python has an inbuilt function for this task. The **sum()** function in python returns the sum of all the elements of an iterable.

**What are Iterables ? **

Iterables are basically collections of data that can be used to store data efficiently. Before understanding the sum() function, one should know about the iterables in python.

There are 4 iterables pre-defined in python : ### 1. Lists Lists are collections of data values. They are *index-based*, meaning that the order of elements is preserved and we can access the elements with their index in the list.

They are also *heterogenous* meaning that we can create lists with multiple data type elements in the same list. Lists in python can be defined using the **list()** function or just enclosing all the values in **box-brackets’[]’**.

The list() function takes an iterable as parameter, meaning that one can give directly the list values as arguement or give an already defined iterable as arguement, whose values will be taken as the list values.

# list definition without list function

lis1 = [1, 2, 3, 4, 5]

# direct values

lis2 = list((6, 7, 8, 9, 10))

# from other list

lis3 = list(lis2)

**2. Tuples**

Tuples are also index-based, heterogenous collections of data like lists. They can be defined using *tuple()* function or enclosing values in *parentheses’()’* The only difference between a tuple and a list is that a tuple is **immutable(can not be modified)** while a list is **mutable(can be modified)**

# list definition without list function

tup1 = (1, 2, 3, 4, 5)

# direct values

tup2 = tuple((6, 7, 8, 9, 10))

# from other tuple

tup3 = tuple(lis2)

**3. Dictionaries**

Dictionaries are a very useful data structure provided in python. A dictionary consists a collection of *key-value pairs*. It can be declared as key-value pairs in *curly-brackets* or using *dictionary() function*. Dictionaries are **immutable** like tuples and cannot contain elements with same keys i.e. **duplicate keys are not allowed**.

#using dictionary() function

dict1 = dictionary({1:”cherry”, 2:”tomato”, 3:”mango”})

#without dictionary() function

dict2 = {1:”cherry”, 2:”tomato”, 3:”mango”}

A dictionary differs from other iterables as its elements can be accessed through both *index* and *keys*. The *key()* and *value()* functions can be used to access the keys and associated values of a dictionary element respectively.

dict = {“fruit1″:”cherry”, “fruit2″:”tomato”, “fruit3″:”mango”}

# using index

a = dict[1].key() # a contains 1

b = dict[1].value() # b contains “tomato”

# using keys

c = dict[“fruit1”] # c contains “cherry”

**4. Sets**

Sets in python are collections of data which are **unordered** meaning that we cannot access the elements of a set with index numbers. Moreover, sets are also **immutable** and do **not allow duplicate values**. Sets are used for *quick removal of duplicate values* and *mathematical operations like Union etc*. Sets can be defined using the *set()* function or the *curly-brackets’{}’*

#using set() function

set1 = set({“cherry”, “tomato”, “mango”})

#without set() function

set2 = {“cherry”, “tomato”, “mango”}

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**Syntax for Sum Function Python**

The sum() function in python can be used with the following syntax: ** sum(iterable, start)** This syntax returns the sum of all the values of the iterable and the start parameter. The value of start paramater is taken to be if

**no arguement**is passed. ### sum() for list

#for list

lis1 = [1, 2, 3, 4, 5]

print(“sum for list : “)

print(sum(lis1))

print(“sum for list with start 5: “)

print(sum(lis1, 5))

**Output**

sum for list :

15

sum for list with start 5:

20

**Sum() for Tuple**

#for tuple

tup1 = (1, 2, 3, 4, 5)

print(“sum for tuple : “)

print(sum(tup1))

print(“sum for tuple with start 5: “)

print(sum(tup1, 5))

**Output**

sum for tuple :

15

sum for tuple with start 5:

20

**Sum() for Dictionary**

#for dictionary

dict1 = {“a”:1, “b”:2, “c”:3, “d”:4, “e”:5}

print(“sum for dictionary : “)

print(sum(dict1))

print(“sum for dictionary with start 5: “)

print(sum(dict1.values(), 5))

**Output**

sum for dictionary :

15

sum for dictionary with start 5:

20

**Sum() for Set**

#for set

set1 = {1, 4, 3, 2, 5}

print(“sum for set : “)

print(sum(set1))

print(“sum for set with start 5: “)

print(sum(set1, 5))

**Output**

sum for set :

15

sum for set with start 5:

20

**Where Can Sum Dunction Python be Used ?**

sum function Python has many practical uses. Here is an example of *Calculating the Average of the elements of a list*

#Calculating average of list elements using sum()

numList = [1, 2, 3, 4, 5]

sum = sum(numList)

avg = sum/len(numList)

print(f”The Average of list items is : {avg}”)

**Output**

The Average of list items is : 3.0

**Exceptions**

The Sum function Python works only with numeric values(int, float, complex). Else it throws an exception.

# A list with non-numeric element

lis = [1, 2, ‘a’, 4]

print(sum(lis))

**Output**Traceback (most recent call last):

File “<string>”, line 5, in <module>

TypeError: unsupported operand type(s) for +: ‘int’ and ‘str’

**Wrap Up**

I hope this article would help you a lot to understand Sum function Python. In this article we have given all the crucial details on how to use Sum function Python. Therefore whenever you are trying to use Sum function in your Python code then you can also take the reference from this article.