❮ Built-in Functions
Example
Add all items in a tuple, and return the result:
a = [1, 2, 3, 4, 5]
x = sum[a]
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Definition and Usage
The sum[] function returns a number, the sum of all items in an iterable.
Syntax
Parameter Values
| iterable | Required. The sequence to sum |
| start | Optional. A value that is added to the return value |
More Examples
Example
Start with the number 7, and add all the items in a tuple to this number:
a = [1, 2, 3, 4, 5]
x = sum[a, 7]
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❮ Built-in Functions
The sum[] function adds the items of an iterable and returns the sum.
Example
marks = [65, 71, 68, 74, 61]
# find sum of all marks
total_marks = sum[marks]
print[total_marks]
# Output: 339sum[] Syntax
The syntax of the sum[] function is:
sum[iterable, start]
The sum[] function adds start and items of the given iterable from left to right.
sum[] Parameters
- iterable - iterable [list, tuple, dict, etc]. The items of the iterable should be numbers.
- start [optional] - this value is added to the sum of items of the iterable. The default value of start is 0 [if omitted]
sum[] Return Value
sum[] returns the sum of start and items of the given iterable.
Example: Working of Python sum[]
numbers = [2.5, 3, 4, -5]
# start parameter is not provided
numbers_sum = sum[numbers]
print[numbers_sum]
# start = 10
numbers_sum = sum[numbers, 10]
print[numbers_sum]Output
4.5 14.5
If you need to add floating-point numbers with exact precision, then you should use math.fsum[iterable] instead.
If you need to concatenate items of the given
iterable [items must be strings], then you can use the join[] method.
'string'.join[sequence]
Visit this page to learn about, Python join[] Method
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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