execute task only one time during next fix time after it's first execution

Hello Friends,


I am back :)

First Wish you a very happy new year.

I know it's too late ;)

Today we are going to learn how can we execute a task only one time for some some specific time period .

Example : You want to give bonus to any user only one time in a day when user access 'about-us' template.
So Let user access that page multiple times in a day still user will got bonus will once.
Guess  about-us is django view .
<pre>

from functools import wraps
from django.core.cache import cache

def execute_once_in(seconds):
    def decorator(func):
        def inner_decorator(*args, **kwargs):
            key = "%s.%s" % (func.__module__, func.__name__)
            #Django used localmemcache as local cache system
            key = key.replace(' ','_') # memcache doesn't like spaces
            # func() didn't execute or returned nothing
            if cache.get(key):
                return
            cache.set(key, True, seconds)
            return func(*args, **kwargs)
        return wraps(func)(inner_decorator)
    return decorator


@execute_once_in(5)   # function will execute only once in each 5 second .
def bonus():
    print "we are executing logic for bonus"

def about_us(request):
     bonus()
    #execution
</pre>