Python Constants

In programming, there are times when you need to store values that remain unchanged throughout the execution of your program. These immutable values are typically stored in constants.

In many programming languages, constants are supported directly, allowing you to define values that cannot be modified once set. However, Python doesn't have built-in support for constants.

Python's Approach to Constants

While Python doesn't enforce the use of constants, there's a widely accepted convention to simulate them. You can declare a variable with an all-uppercase name to indicate that it should be treated as a constant. For example:

FILE_SIZE_LIMIT = 2000

Here, FILE_SIZE_LIMIT is intended to be a constant, meaning its value should not be altered during the program's execution. This practice is based on convention rather than strict language rules, so it's essential to maintain discipline when handling such variables.

Summary

• Python does not have built-in constants: There's no specific data type or keyword to define a constant in Python.
• Convention over rules: Use all capital letters to name a variable that should act as a constant, signaling that its value is intended to remain unchanged.

While Python may not enforce constants, following this convention ensures that your code remains clear, predictable, and easy to maintain.