Decorator Function Python

So as not to disturb your neighbors the following example will only run the decorated code during the day.

Decorator function python. What is Python Decorator. Above we have defined a greet function and then immediately decorated it by running it through the null_decorator function. Decorators are very powerful and useful tool in Python since it allows programmers to modify the behavior of function or class.

The program controller passes the function object as a parameter to the decorator function 3. Python makes creating and using decorators a bit cleaner and nicer for the programmer through some syntactic sugar To decorate get_text we dont have to get_text p_decoratorget_text There is a neat shortcut for that which is to mention the name of the decorating function before the function to be decorated. Because wrapper is a regular Python function the way a decorator modifies a function can change dynamically.

This is the simple Python decorator example. Because the decorator never runs return funcargs kwargs so it just returns None by defaultas all Python functions do. Consider the following example.

Also this is called metaprogramming because a part of the program tries to modify another at compile time. This design pattern allows a programmer to add new functionality to existing functions or classes without modifying the existing structure. Dec2 dec1 def funcarg1 arg2.

The current syntax for function decorators as implemented in Python 24a2 is. Def funcarg1 arg2. A decorator in Python is a function that takes another function as its argument and returns yet another function.

This supports more readable applications of the DecoratorPattern but also other uses as well. Pass func dec2dec1func without the intermediate assignment to the variable func. The function inside the decorator function gets executed 4.