Optional parameters are parameters that do not need to be provided when calling a function or method. If they are not supplied, the function will use default values defined in the function's signature. This allows for more flexible function calls.
In Python, you can define optional parameters by assigning default values to them in the function definition. For example:
def greet(name, greeting="Hello"):
return f"{greeting}, {name}!"In this example, greeting is an optional parameter with a default value of "Hello". You can call the function in two ways:
-
Providing both parameters:
message = greet("Alice", "Hi") # Output: "Hi, Alice!" -
Providing only the mandatory parameter:
message = greet("Alice") # Output: "Hello, Alice!"
If you do not provide a value for the optional parameter, the function will use the default value specified. This makes optional parameters useful for creating functions that can handle a variety of input scenarios without requiring all arguments to be specified every time.
