Useful Django Decorators

decorators.py

#  To pass optional arguments to decorator
def the_decorator(arg1, arg2):

    def _method_wrapper(view_method):

        def _arguments_wrapper(request, *args, **kwargs) :
            """
            Wrapper with arguments to invoke the method
            """

            #do something with arg1 and arg2

            return view_method(request, *args, **kwargs)

        return _arguments_wrapper

    return _method_wrapper
  
#  Example
@the_decorator("an_argument", "another_argument")
def event_dashboard(request, event_slug):
   
   

#  To print time consumed by the function
def timeit(method):

   def timed(*args, **kw):
       ts = time.time()
       result = method(*args, **kw)
       te = time.time()
       print('%r (%r, %r) %2.2f sec' % (method.__name__, args, kw, te - ts))
       return result

   return timed

#  To create chain of decorators
from functools import wraps

def makebold(fn):
    @wraps(fn)
    def wrapped(*args, **kwargs):
        return "<b>" + fn(*args, **kwargs) + "</b>"
    return wrapped

def makeitalic(fn):
    @wraps(fn)
    def wrapped(*args, **kwargs):
        return "<i>" + fn(*args, **kwargs) + "</i>"
    return wrapped

@makebold
@makeitalic
def hello():
    return "hello world"

@makebold
@makeitalic
def log(s):
    return s

print hello()        # returns "<b><i>hello world</i></b>"
print hello.__name__ # with functools.wraps() this returns "hello"
print log('hello')   # returns "<b><i>hello</i></b>"