How do you define a default parameter in a function?

A default parameter in a function is defined by assigning a value directly in the function definition. This means that when you declare a function, you can specify a default value next to the parameter name. If the function is called without providing an argument for that parameter, the default value is used.

For example, consider the following function definition:

def greet(name="Guest"):

print(f"Hello, {name}!")

In this case, the parameter name has a default value of "Guest". If you call greet() without an argument, it will print "Hello, Guest!", utilizing the default value. However, if you call greet("Alice"), it will print "Hello, Alice!", using the provided argument instead.

This behavior allows for more flexible function calls and can simplify code by reducing the number of arguments required when a common value is acceptable.