Python is a powerful programming language that is used by developers worldwide. However, returning **None** is not an uncommon practice in Python.

When Python code is executed, functions may return **None** instead of a value. This is often a source of frustration for developers. But don’t worry! In this tutorial, you will learn how to avoid returning **None** in Python.

### Steps to Avoid Returning None in Python

Let’s take a look at some steps you can follow to avoid returning **None** in Python.

Step | Description |
---|---|

1 | Always have a return statement in your function |

2 | Return a meaningful value instead of None |

3 | Use assertion statements to check the return value of a function |

### Step 1: Always have a return statement in your function

In Python, if a function does not have a return statement, it will automatically return **None**.

1 2 |
def add_numbers(a, b): result = a + b |

Here, if you call the `add_numbers`

function, it will return **None**.

1 |
add_numbers(2, 3) |

**output:**

None

To avoid returning **None**, make sure that your function always has a return statement.

1 2 3 |
def add_numbers(a, b): result = a + b return result |

Now, if you call the `add_numbers`

function, it will return the sum of the two numbers instead of **None**.

1 |
add_numbers(2, 3) |

**output:**

5

### Step 2: Return a meaningful value instead of None

When writing a function, make sure that it returns a meaningful value. Returning **None** is often a sign of a badly written function.

For example, if you have a function that calculates the area of a circle, you should make sure that it returns the area and not **None**.

1 2 3 4 5 |
import math def calculate_circle_area(radius): area = math.pi * radius ** 2 return area |

Now, if you call the `calculate_circle_area`

function, it will return the area of the circle instead of **None**.

1 |
calculate_circle_area(2) |

**output:**

12.566370614359172

### Step 3: Use assertion statements to check the return value of a function

In Python, you can use assertion statements to check if a function returns the expected value.

For example, if you have a function that calculates the area of a circle, you should use an assertion statement to check if the function returns the correct value.

1 2 3 4 5 6 7 |
import math def calculate_circle_area(radius): area = math.pi * radius ** 2 return area assert calculate_circle_area(2) == 12.566370614359172 |

If the assertion statement fails, it means that the function is returning the wrong value.

## Conclusion

In conclusion, returning **None** in Python is often a source of frustration for developers. However, by following the steps outlined in this tutorial, you can avoid returning **None** and write better Python code.

## Full Code Listing

1 2 3 4 5 6 7 8 9 10 11 12 |
import math def add_numbers(a, b): result = a + b return result def calculate_circle_area(radius): area = math.pi * radius ** 2 return area assert add_numbers(2, 3) == 5 assert calculate_circle_area(2) == 12.566370614359172 |