Python Decorators

Simple decorator

Decorating the function flower, to print red roses

def decorate(func):
    def _wrapper():
        return "red %s" % func()
    return _wrapper

@decorate
def flower():
    return "roses"


print(flower)
# <function decorate.<locals>._wrapper at 0x7fdcd850c700>

print(flower())
# red roses

Decorate a function with parameters

Decorating the function flowers, which receive the flower name as a parameter.

def decorate(func):
    def _wrapper(name):
        return "red %s" % func(name)
    return _wrapper

@decorate
def flower(name):
    return name


print(flower)
# <function decorate.<locals>._wrapper at 0x7fdcd850c700>

print(flower("dahlias"))
# red dahlias

Passing data to the decorator function

The color will be available in the inner scopes when creating the decorator .

def create_decorator(color):
    def _decorate(func):
        def _wrapper(name):
            return f"{color} {func(name)}"
        return _wrapper
    return _decorate

@create_decorator("blue")
def flower(name):
    return name


print(flower)
# <function create_decorator.<locals>._decorate.<locals>._wrapper at 0x7f360530c790>

print(flower("bluebell"))
# blue bluebell

References

python  decorators