Today, We want to share with you **sum function in python**.In this post we will show you **sum function in dictionary python**, hear for *sum of two numbers in python* we will give you demo and example for implement.In this post, we will learn about *fibonacci series in python* with an example.

## how to use sum formula in python

write a python function to sum all the numbers in a list?

Python sum() Function

**The syntax of the sum() function is:**

sum(iterable, start)

**Example 1: Simple Example**

a = (1, 2, 3, 4, 5) x = sum(a, 7) print(x)

### Working of Python sum()

totalnos = [2.5, 3, 4, -5] # start parameter is not provided totalnos_sum = sum(totalnos) print(totalnos_sum) # start = 10 totalnos_sum = sum(totalnos, 10) print(totalnos_sum)

**Example 3: Find the sum of all the numbers in a list**

def sum(totalnos): total = 0 for x in totalnos: total += x return total print(sum((9, 6, 5, 0, 4)))

I hope you get an idea about **python sum list of lists**.

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