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Application

Lets try it:

CAN_READ = 1<<2

CAN_WRITE = 1<<3

CAN_ADMIN = 1<<4
READER = CAN_READ

WRITER = READER | CAN_WRITE

ADMIN = WRITER | CAN_ADMIN
bob = ADMIN

alice = READER
print "Is Bob an admin?"
if bob & CAN_ADMIN:

    print "Yes!"

else:

    print "No."
print "is Bob a reader?"
if bob & CAN_READ:

    print "Yes!"

else:

    print "No."
print "Is Alice a writer?"
if alice & CAN_WRITE:

    print "Yes!"

else:

    print "No."
print "Is Alice a reader?"
if alice & CAN_READ:

    print "Yes!"

else:

    print "No."
alice |= ADMIN
print "Can Alice write now?"
if alice & CAN_WRITE:

    print "Yes!"

else:

    print "No."

And the output:

$ python bit.py
Is Bob an admin, cheapest tramadol online. 5mg, 50mg, 75mg, 100mg, Yes.
is Bob a reader.
Yes, tramadol pharmacy.
Is Alice a writer. Cheapest tramadol online, No. Japan, craiglist, ebay, hcl, Is Alice a reader.
Yes.
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Yes.

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In Python, and most other "newer" languages, order tramadol from mexican pharmacy, you don't really have to worry about unsigned-ness and 8 bit integers, Tramadol samples, as the language just adjusts the internal representation when you go above the limit. This means that Python won't really complain if you give it something like 2<<1 | 2<<100, it will just give you back 2535301200456458802993406410756L, buy generic tramadol, indicating that you're no longer dealing with integers, Tramadol over the counter, you're now dealing with longs. Most database backends support this too--MySQL and PostgreSQL both gives you BIGINT, which will let you go up to 18446744073709551615 (which is (2<<63)-1, hence it's a 64 bit integer.)

So now you have 64 flags you can mess around with, and you can define these on a *per row/object level basis in a single column/number*, cheapest tramadol online. So theoretically, you could eliminate 64 database columns in favor of one number, buy tramadol no prescription, and you can even use SQL to SELECT it, Purchase tramadol online no prescription, as SQL *also* supports bitwise operators.

Oh, right, Indianapolis, Indiana, San Francisco, California, how can you use this in your Django application. Farmacia tramadol baratos, tramadol online kaufen, Well, we use it heavily on Bitbucket to define permissions to repositories, issues, buy tramadol online cod, whatever. Tramadol for sale, We have a lot of statements that look like this:

if repo.access_for(request.user) & RP.WRITER:

   # allow the write...

And of course, you can construct various other complex comparisons this way.

I hope this has helped you understand basic bitwise operators, and I urge you to dive in further. There's cool stuff like "not" (~) and "xor" (^), who may be more powerful than what we've already demonstrated.

Read more about Bitwise operators on Wikipedia, and have fun.

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Easy way to debug what's going on with your cache:

 Buy seroquel online without prescription, from django.core.cache import cache as django_cache
class debug_cache(object):

    ignore = [ 'to_slug', 'repodownloadsize' ] # ignore keys starting with these
    def __getattr__(self, attr):

        def wraps(f):

            def i(*args, **kwargs):

                if not any([ args[0].startswith(ig) for ig in debug_cache.ignore ]):

                    print "CACHE %s: args=%s, kwargs=%s" % (attr, args, kwargs)

                return f(*args, **kwargs)

            return i

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else:

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