Do you need to **create a function that returns a float** but you don’t know how? No worries, in sixty seconds, you’ll know! Go! π₯π₯π₯

A Python function can return any object such as a float value such as `3.14`

. To return a float, you can use the built-in `float()`

function or create your own function with an arbitrary simple or complex expression within the function body and put the result of this after the `return`

keyword (e.g., `return 10/3`

).

π **Recommended Tutorial**: The `return`

keyword in Python

## Method 1: Using the float() Function

Python’s `float()`

function takes an argument such as a string or an integer and attempts to convert it to a float. You don’t need to import a library as it is built-in. For example, `float('3.14')`

converts the string to a float 3.14 and `float(3)`

converts the integer to the float `3.0`

.

Here’s a code snippet exemplifying this approach:

# String to Float x = '3.14' print(float(x)) # 3.14 # Int to Float x = 3 print(float(x)) # 3.0

βββ This is the most straightforward approach to returning a float from a function.

You can also watch my explainer video and visit the recommended blog tutorial on the topic:

π **Recommended Tutorial**: Python float() Function

## Method 2: Create Your Own Function and Return Float Right Away

You can create your custom function returning a float by using the keyword `def`

, followed by a function name, followed by an arbitrarily complicated function body to determine the resulting float. Say, you’ve stored the resulting float in the local variable `x`

. To return it from the function, use the expression `return x`

.

Let’s have a look at a minimal example that creates a function `my_float()`

that returns a float value `3.14`

and does nothing else:

def my_float(): return 3.14 print(my_float()) # 3.14

βββ This is the most flexible approach to returning a float from a function because you can do anything in the function body, it’s Turing complete!

## Method 3: Use Float Return Expression

In your function body, you can also use arbitrary mathematical or programmatical expressions to determine the float. For example, the expression `return 10/3`

computes the float as the result of the division operator on two ints and returns it from the function.

Here’s an easy example:

def my_float(): return 10/3 print(my_float()) # 3.3333333333333335

Note that floats can be imprecise and introduce floating point errors, especially in the representation of digits far into the right of the decimal point. That’s why `10/3`

yields `3.333333333333335`

in the previous example.

Feel free to check out my “Division Deep Dive” video:

## Method 4: Use Complicated Function Body to Compute Float

For comprehensibility, you can use an arbitrarily complex function body to calculate and return a float value.

Here’s an example of computing the value *Ο* (*Pi*) in the function body:

def calculate_pi(): pi = 0 n = 10**7 add = True for i in range(1, n, 2): if add: pi += 1/i else: pi -= 1/i add = not add return pi*4 print(calculate_pi()) # 3.1415924535897797

This uses the Leibniz formula for computing *Ο*:

If you want to learn more about this code snippet to calculate the value of Pi, feel free to check out our Finxter tutorial on the topic.

## Related Tutorials

- Python Return String From Function
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- Python Return Integer From Function

## Programmer Humor

**Q**: How do you tell an introverted computer scientist from an extroverted computer scientist?
**A**: An extroverted computer scientist looks at *your* shoes when he talks to you.

While working as a researcher in distributed systems, Dr. Christian Mayer found his love for teaching computer science students.

To help students reach higher levels of Python success, he founded the programming education website Finxter.com that has taught exponential skills to millions of coders worldwide. He’s the author of the best-selling programming books Python One-Liners (NoStarch 2020), The Art of Clean Code (NoStarch 2022), and The Book of Dash (NoStarch 2022). Chris also coauthored the Coffee Break Python series of self-published books. He’s a computer science enthusiast, freelancer, and owner of one of the top 10 largest Python blogs worldwide.

His passions are writing, reading, and coding. But his greatest passion is to serve aspiring coders through Finxter and help them to boost their skills. You can join his free email academy here.