/TIts0e..;“`
def decorator_function(some_function):
def wrapper(msg):
print(f”Message before the call: msg”)
some_function(msg)
print(f”Message after the call: msg”)
Image: www.logicread.com
return wrapper
@decorator_function
def simple_function(msg):
print(msg)
simple_function(“Hello, world!”)
“The code modifies the behaviour of thesimple_function` by wrapping it using a decorator. In this example, decorator_function adds some functionality before and after calling the wrapped function, which is simple_function.
Here’s the step-by-step breakdown of the code:
- decorator_function: This is the decorator function that accepts another function (some_function) as an argument and returns a wrapper function (inner function). Inside the decorator_function:
- wrapper function: This is the actual function that gets executed when the decorated function is called. It takes a parameter msg. In the wrapper function:
- It prints a message before calling some_function, indicating the message passed to the decorated function.
- It calls some_function and passes msg to it.
- After some_function is executed, it prints another message indicating the message passed to the decorated function.
- @decorator_function: This is used to apply the decorator_function to a function. Here, it is applied to the simple_function. When you use @decorator_function, the following happens:
- The decorator function (decorator_function) is called with simple_function as an argument.
- The result of the decorator function is the wrapper function, which will replace the original simple_function.
-
simple_function: This is the function you want to decorate. It takes a parameter msg, and inside it prints the message.
-
simple_function(“Hello, world!”): When you call simple_function(“Hello, world!”), the following happens:
- The call is redirected to the wrapper function, which is now responsible for handling the call.
- The wrapper function prints the “Message before the call: Hello, world!” message.
- It then calls the original simple_function with “Hello, world!” as an argument, which prints “Hello, world!”.
- Finally, the wrapper function prints the “Message after the call: Hello, world!” message.
In summary, this code decorates the simple_function with additional functionality added by the wrapper function. When simple_function is called, it behaves as expected, but the decorator adds messages before and after the call.
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