Home > Backend Development > Python Tutorial > Why Does My Python Function Return `None`?

Why Does My Python Function Return `None`?

Susan Sarandon
Release: 2024-11-29 02:52:10
Original
1048 people have browsed it

Why Does My Python Function Return `None`?

Function Returns None: Understanding Returned Values

In the Python programming language, every function inherently returns a value, even if the developer does not explicitly specify one. If no specific value is provided, Python assigns the default value of None to the function's return.

Consider the following code snippet:

def printmult(n):
    i = 1
    while i <= 10:
        print (n * i, end = ' ')
        i += 1
    
print(printmult(30))
Copy after login

This function, printmult(), takes an input value n and prints the result of multiplying n by integers from 1 to 10. The print statement within the function does not explicitly return a value. Therefore, when you call the function at the end of the script and assign its result to a variable (in this case, print(printmult(30))), the variable will contain None.

It is essential to understand the distinction between printing and returning. While printing displays the result on the output console, returning assigns a value to the function itself. To specify a specific return value, simply add a return statement with the desired value inside the function definition, as shown below:

def printmult(n):
    i = 1
    while i <= 10:
        print (n * i, end = ' ')
        i += 1
    return n * 10  # Example return value
Copy after login

By modifying the code in this way, you can now access the returned value when calling the printmult() function. Remember, it is always good practice to explicitly specify return values in your functions to avoid unexpected results and ensure that your code behaves as intended.

The above is the detailed content of Why Does My Python Function Return `None`?. For more information, please follow other related articles on the PHP Chinese website!

source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template