Default Argument In Python

Python allows function arguments to have default values. If the function is called without the argument, the argument gets its default value. Default Arguments Python has a different way of representing syntax and default values for function arguments. Default values indicate that the function argument will take that value if no argument value

Learn how to use default values in Python functions to simplify your code and make it more flexible. See how to specify multiple default parameters, mix them with regular parameters, and use them in documentation.

Python default arguments are a powerful feature that enhances the flexibility and usability of functions. By understanding the fundamental concepts, proper usage methods, common practices, and best practices, you can write more robust and maintainable code. Remember to use immutable objects as default arguments, be careful when changing default

By using default arguments, you can define a function with sensible defaults while still allowing users to override those values if necessary. Python Default Arguments Syntax and Usage. To define default arguments in Python, you can specify the default values directly in the function's parameter list. Here's the syntax

Learn how to use default arguments in Python functions to assign values to function arguments if no explicit values are passed from the function call. See examples of functions with one or multiple default arguments and how to override them.

When you call a function and pass an argument to the parameter that has a default value, the function will use that argument instead of the default value. However, if you don't pass the argument, the function will use the default value. To use default parameters, you need to place parameters with the default values after other parameters.

Example of Default Arguments. The following example shows use of Python default arguments. Here, the second call to the function will not pass value to quotcityquot argument, hence its default value quotHyderabadquot will be used. Function definition def showinfo name, city quotHyderabadquot quotThis prints a passed info into this functionquot print quotNamequot, name print quotCityquot, city return Now call

Using default function arguments and None in Python can make your code more flexible and robust. Always use None as a default argument for mutable objects to avoid unexpected behavior. For more on handling None , check out our guide on Understanding None in Python Equivalent of Null .

Here, the tax_rate parameter defaults to 8 0.08 which is a common rate in many US states. But the function allows passing a different rate when needed. Read How to Use the arange Function in Python?. Beware the Mutable Default Argument. One important gotcha with default arguments is that Python evaluates them only once when the function is defined, not each time it's called.

Python Default Parameter Value Python Glossary. Default Parameter Value. The following example shows how to use a default parameter value. If we call the function without argument, it uses the default value Example. def my_functioncountry quotNorwayquot printquotI am from quot country my_functionquotSwedenquot