How do I declare a constant variable?

In Python, there is no built-in way to declare constants like in some other programming languages. However, a common convention is to use uppercase letters for variable names to indicate that they should be treated as constants.

Example of Declaring a Constant Variable:

PI = 3.14159
MAX_USERS = 100

Key Points:

Naming Convention: Use uppercase letters with underscores to separate words (e.g., MAX_VALUE).
No Enforcement: Python does not enforce immutability, so you can technically change the value of a "constant" variable, but it's discouraged.
```
PI = 3.14  # This is allowed, but not recommended
```
Using Constants: You can use these constants throughout your code, and it’s a good practice to avoid changing their values.

Example Usage:

def calculate_area(radius):
    return PI * (radius ** 2)

print(calculate_area(5))  # Outputs: 78.53975

If you have further questions about constants or any other topic, feel free to ask!