# Python sum() Function

The sum() function in Python is used when we need to find the sum of all items available in an iterable such as list, tuple etc. For example:

```x = [1, 2, 3, 4, 5]
print(sum(x))

x = (12, 23, 34, 54)
print(sum(x))```

The output is:

```15
123```

## Python sum() Function Syntax

The syntax of sum() function in Python, is:

`sum(iterable, value)`

The value parameter is optional, that is used when we need to add extra value to the result returned by sum().

Note - The iterable should contain numbers to perform the addition of its all items using sum() function.

## Python sum() Function Example

Here is an example of sum() function in Python:

```x = [1, 2, 3, 4, 5]

print(sum(x))
print(sum(x, 5))
print(sum(x, 10))
print(sum(x, 100))
print(sum([1, 2, 3, 4, 5], 100))

x = {1: "Name", 2: "University", 3: "Course"}
print(sum(x))```

The output is:

```15
20
25
115
115
6```

If you use dictionary as an iterable, then its key will be used.

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