python function with default values

Publicado em: 13 Dezembro 2023
no canal de: CodeLines

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In Python, functions can be defined with default values for their parameters. Default values allow you to define parameters with a preset value, which is used when the caller does not provide a specific value for that parameter. This feature enhances the flexibility and readability of your code. In this tutorial, we'll explore how to use default values in Python functions with clear examples.
In this example, the greet function has a default value of "Hello" for the greeting parameter. When the function is called without providing a value for greeting, it uses the default value.
This example demonstrates a function with multiple parameters having default values. The power function calculates the power of a number and has default values for both exponent (default is 2) and display (default is False).
Be cautious when using mutable objects (like lists or dictionaries) as default values. In this example, the default value for items is an empty list. However, because lists are mutable, the same list is used in subsequent calls, leading to unexpected behavior. To avoid this, use None as a default and create a new object inside the function:
This ensures that a new list is created for each function call.
Default values in Python functions provide a convenient way to make functions more flexible and user-friendly. By setting default values for parameters, you can define functions that work well in a variety of scenarios while maintaining a clean and readable codebase.
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