Python sum()
The sum() is a built-in python function which sums all the items of a given iterable.
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Python sum()
The syntax of the sum() function is:
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sum(iterable, start)
sum() Parameters
The sum() functions takes two parameters as argument:
- iterable - Any iterable or sequence which contains numbers. For Example list, tuple, dict, etc)
- start (Optional) - A value that is added to the return value. Default it will take 0.
Let see some examples of sum() in python.
Example 1: How to use sum() with python list?
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numbers = [2,8,4,3,7,1]
# start parameter is not provided
numbers_sum = sum(numbers)
print(numbers_sum)
# start = 10
numbers_sum = sum(numbers, 10)
print(numbers_sum)
Output:
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25
35
Example 2: Using floating numbers with sum() function.
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numbers = [4.6,6.2,0.4,5.3]
# start parameter is not provided
numbers_sum = sum(numbers)
print(numbers_sum)
Output:
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16.5
Example 3 : Using negative numbers with sum() functions.
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numbers = [-2,-9,-4,-3,-5]
# start parameter is not provided
numbers_sum = sum(numbers)
print(numbers_sum)
Output:
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-23
Rules of sum()
- sum() function takes on iterable as parameters.
- All the iterable must contain numbers as all items.
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