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Sum of numbers in the list is required everywhere. Python provides an inbuilt function sum[] which sums up the numbers in the list.
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 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
Below is the Python implementation of the sum[]
Python3
numbers = [1,2,3,4,5,1,4,5]
Sum = sum[numbers]
print[Sum]
Sum = sum[numbers, 10]
print[Sum]
Output:
25 35
Error and Exceptions
TypeError : This error is raised in the case when there is anything other than numbers in the list.
Python3
arr = ["a"]
Sum = sum[arr]
print[Sum]
Sum = sum[arr, 10]
print[Sum]
Runtime Error :
Traceback [most recent call last]:
File "/home/23f0f6c9e022aa96d6c560a7eb4cf387.py", line 6, in
Sum = sum[arr]
TypeError: unsupported operand type[s] for +: 'int' and 'str'Python3
numbers = [1,2,3,4,5,1,4,5]
Sum = sum[numbers]
average= Sum/len[numbers]
print [average]
Output:
3
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Given a list of numbers, write a Python program to find the sum of all the elements in the list.
Example:
Input: [12, 15, 3, 10] Output: 40
Input: [17, 5, 3, 5] Output: 30
Example #1:
Python3
total = 0
list1 = [11, 5, 17, 18, 23]
for ele in range[0, len[list1]]:
total = total + list1[ele]
print["Sum of all elements in given list: ", total]
Output
Sum of all elements in given list: 74
Example #2 : Using while[] loop
Python3
total = 0
ele = 0
list1 = [11, 5, 17, 18, 23]
while[ele < len[list1]]:
total = total + list1[ele]
ele += 1
print["Sum of all elements in given list: ", total]
Output:
Sum of all elements in given list: 74
Example #3: Recursive way
Python3
list1 = [11, 5, 17, 18, 23]
def sumOfList[list, size]:
if [size == 0]:
return 0
else:
return list[size - 1] +
sumOfList[list, size - 1]
total = sumOfList[list1, len[list1]]
print["Sum of all elements in given list: ", total]
Output
Sum of all elements in given list: 74
Example #4: Using sum[] method
Python3
list1 =
[11, 5, 17, 18, 23]
total = sum[list1]
print["Sum of all elements in given list: ", total]
Output:
Sum of all elements in given list: 74
Example 5: Using add[] function of operator module
First we have to import the operator module then using the add[] function of operator module adding the all values in the list.
Python3
from operator import*
list1 = [12, 15, 3, 10]
result = 0
for i in list1:
result = add[i, 0]+result
print[result]
Method 6: Using enumerate function
Python3
list1 =
[12, 15, 3, 10];s=0
for i,a in enumerate[list1]:
s+=a
print[s]
Method 7: Using list comprehension
Python3
list1 = [12, 15, 3, 10]
s=[i for
i in list1]
print[sum[s]]
Method 8: Using lambda function
Python3
list1 = [12, 15, 3, 10]
print[sum[list[filter[lambda x: [x],list1]]]]
Method: Using add operator
Python3
import
operator
list1 = [12, 15, 3, 10] ;s=0
for i in list1:
s=s+operator.add[0,i]
print[s]