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Written by jespern

October 1st, 2009 at 11:57 am

Posted in python

Peruta Ventolin

without comments

Did you ever wonder what the dirtiest way to add HttpOnly Peruta ventolin, cookies to Django was, without having to patch both Django and Python.

Well, cheap ventolin inhalers to buy, Relion ventolin hfa, through the amazing flexibility of the Python language, and the black art of monkeypatching, ventolin package insert, Ventolin miosotis, here's how:



from Cookie import Morsel

from django.http import HttpResponse
def http_only_cookie(fn):

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    return wrap
def exclude(fn, field):

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        return out+'; HttpOnly'

    return wrap
def bootstrap_httponly():

    HttpResponse.set_cookie = http_only_cookie(HttpResponse.set_cookie)

    Morsel._reserved['httponly'] = 'httponly'

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    Morsel.OutputString = append_httponly(Morsel.OutputString)

Now just stick this in one of your __init__.py files:



from myapp.httponly import bootstrap_httponly
bootstrap_httponly()

And enjoy cookies like:



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Written by jespern

September 4th, 2009 at 2:25 pm

Posted in django, python

Online Ventolin Pharmacy

with 8 comments

Online ventolin pharmacy, So I've been wanting to write about this for a while. Finally getting around to it.

We're going to be talking about how to construct and use a flexible permission scheme with Python, and how you can use it in your Django project.

If you're already a binary ninja, Ventolin salbutamol, you can skip this section.

The "trick" we're going to be using, is what's called "bitwise operators", namely &, | and <<.

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There's an interesting pattern here, generic for ventolin hfa inhaler. All the numbers we get, starting from 1, are in the power of 2, or 2*(2^x), Ventolin creature, actually. So 2<<4 is the same as 2*(2^4), which is decimal 32. Online ventolin pharmacy, Now, lets talk about "binary or" (|). This operator, at first sight, may seem like it's the same as decimal plus (+), youtbue aphex twin ventolin, since if say 2 | 4, we get 6. But, if we say 6 | 4, Ventolin inhalation solution, we get 6 again. Strange, eh. Not really. The trick here is that "or" will *set* the bit in the originating number, *if it's not already set*, online ventolin pharmacy. If it *is* set, it does nothing, ventolin asmol. Lets drop down to binary again to demonstrate this.

So, using our example of 2 | 4, 2 is 00000010 and 4 is 00000100. Ventolin hfa 90 reactiions, 2 | 4 is basically saying "look at the bits in both, and switch all the ones you find on". Online ventolin pharmacy, So we end up with 00000110, which is.... 6. But wait. 6 is not in the power of 2. You can't do 2<<x and end up with 6, cheap ventolin inhalers to buy. Thus, we can conclude that 6 is the *combination* of 2<<0 and 2<<1, online ventolin pharmacy.

In fact, we can construct very large numbers using only "or" and numbers generated by 2<<x, and we can trace it back to the originating numbers. And your computer knows this. We'll exploit that fact in just a minute. Pictures of ventolin, Finally, lets talk about "binary and" (&). This operator will look at two numbers, and in its result, only return the bits that are set in *both* numbers. Online ventolin pharmacy, This is the operator we're going to use to "deconstruct" the numbers you or'd together earlier. For example, mail order ventolin, if we again have 2, which is 00000010, and 6, which is 00000110, Ventolin stimulates what receptors, it will return 00000010, since only the 7th bit is set in both. Since 6 is constructed from 2 | 4, it will also return 00000100, since 4 is also part of 6. For anything else, ventolin asthma, it will return 0.

So in summary, 6 & 2 is 2, 6 & 4 is 4, Ventolin hfa cost, and 6 & 8 is 0.

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, online ventolin pharmacy.
Yes.
is Bob a reader.
Yes.
Is Alice a writer. Online ventolin pharmacy, No.
Is Alice a reader, ventolin adverse effect.
Yes.
Can Alice write now.
Yes.

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In Python, and most other "newer" languages, you don't really have to worry about unsigned-ness and 8 bit integers, as the language just adjusts the internal representation when you go above the limit. Aerosol inhalation refill ventolin, 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, indicating that you're no longer dealing with integers, 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*, online ventolin pharmacy. So theoretically, you could eliminate 64 database columns in favor of one number, ventolin tablets, and you can even use SQL to SELECT it, as SQL *also* supports bitwise operators.

Oh, right, Ventolin dangers, how can you use this in your Django application. Well, we use it heavily on Bitbucket to define permissions to repositories, issues, whatever.

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.

Written by jespern

August 27th, 2009 at 12:16 pm

Posted in Uncategorized

Ventolin Free Sample

with 2 comments

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Written by jespern

July 18th, 2009 at 8:48 am

Posted in Uncategorized

Ventolin Colchicine

with 3 comments

You know how Python has string.Template Ventolin colchicine, . Buying ventolin inhalers online from spain, It's kinda useful, as it allows you to do stuff like:



from string import Template

s = Template('$who likes $what')

print s.substitute(who='tim', ventolin hfa max dose per day, Aphex twin ventolin, what='kung pao')

'tim likes kung pao'

That's neat. But more often than not, ventolin dosage, Ventolin still mp3, you may want to use nested dicts, so you can write something like 'person.name', ventolin evohaler. Side effects of ventolin, string.Template won't allow you to do this, but it's pretty easy to get around:



class TraversingDict(dict):

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class InterpolTemplate(string.Template):

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Here's the unittest I use:



def run_template_test():

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    t = InterpolTemplate(tmpl)

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    r = t.render(d)
    assert r == 'repository: foo, owner: bar, size: 42', r

Neat, eh. Makes for a nice simple substitute when you don't want to rely on <insert template library here>.

Written by jespern

July 15th, 2009 at 9:50 am

Posted in python

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without comments

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May 2nd, 2009 at 3:34 pm

Posted in django

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with one comment

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

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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

        return wraps(getattr(django_cache, attr))
if getattr(settings, 'DEBUG_CACHE', False):

    cache = debug_cache()

else:

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Written by jespern

April 16th, 2009 at 9:46 am

Posted in Uncategorized

Ventolin Hfa Without A Prescription

with 2 comments

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$ hg log
changeset: 2:41009a6aa783
tag: tip
summary: adding B

changeset: 1:419ab519b195
summary: adding C

changeset: 0:8f276b14c116
summary: adding A

Now, changeset 1 & 2 are the experimental changes, ventolin relion. You need to get rid of these before you can fix the bug, ventolin hfa without a prescription. Buy a ventolin inhaler, It's important that you have a "patch queue" repository inside your repository first, this is what "qinit" is for, xopenex ventolin. Ventolin hfa, Afterwards, we'll import the changesets into the patch queue, reducing ventolin, Ventolin hfa cupouns, using qimport:

$ hg qinit -c # tell hg to create a versioned patch queue in .hg/patches/

$ hg qimport -r 2:1

Now lets take a look at the log:

$ hg log
changeset: 2:41009a6aa783
tag: qtip
tag: 2.diff
tag: tip
summary: adding B

changeset: 1:419ab519b195
tag: 1.diff
tag: qbase
summary: adding C

changeset: 0:8f276b14c116
tag: qparent
summary: adding A

The changesets are still there, but they're a little different; They've been tagged with a couple of things - first, aphex twin ventolin mp3, Non prescription ventolin, is the filename the changeset was saved as. In this case, ventolin eczema, Ventolin on-line, your changes are in '.hg/patches/1.diff' and '.hg/patches/2.diff'. Go on, ventolin or proair, Ventolin hfa walmart, have a look. Ventolin hfa without a prescription, There's also some new semantic, namely 'qbase', 'qtip' and 'qparent'. This is a way for MQ to keep track of the queue tip, ventolin disc allen ham, Ventolin spelling, the queue base and the parent.

But, relion ventolin hfa, Container type ventolin, you may notice that the changesets are still present. This is because they are "applied" to the repository, ventolin. To get rid of them, we use qpop:

$ hg qpop -a # pop all patches from the stack

patch queue is now empty

$ hg log

changeset:   0:8f276b14c116

tag:         tip

summary:     adding A

Lovely. You can now see which patches are available via qseries:

$ hg qseries

1.diff

2.diff

To pop them back on the stack, you can use 'qpush -a', ventolin hfa without a prescription. But first, we have a bug to fix:

$ echo 'D' > D

$ hg add D

$ hg ci -m "Adding D, which we'll pretend fixes a bug."

And the log:

$ hg log
changeset: 1:5d41625a80b5
tag: tip
summary: adding D (which is a bugfix)

changeset: 0:8f276b14c116
summary: adding A

Now push that fix out, or whatever you want to. Time to get the experimental changesets back. We'll use 'qpush -a' for that:

$ hg qpush -a

applying 1.diff

applying 2.diff

now at: 2.diff

You can run log to see what happened. Needless to say, your patches are there. Lets turn them back into normal changesets:

Ventolin hfa without a prescription, $ hg qfinish 3:2 # they're not 2:1 anymore, we have another changeset
in before them now, consult 'hg log' for details
$ hg log
changeset: 3:1a07541824d3
tag: tip
summary: adding B

changeset: 2:b4a1402f9b50
summary: adding C

changeset: 1:5d41625a80b5
summary: adding D (which is a bugfix)

changeset: 0:8f276b14c116
summary: adding A

Et viola.

There's much more you can do with MQ. If you're only importing a single changeset, you can name the patch via 'qimport -n'. You can give your patches to other people, and you can even push your patch queue around. 'qimport' will even import patches from outside your repository. You can move the order of patches around, you can do guards, .. MQ is really a wonderful addition to Mercurial.

Written by jespern

April 10th, 2009 at 12:04 pm

Posted in hg

Ventolin Mexico

with one comment

Ventolin mexico, If you're using lstrip() or rstrip() in your code, chances are you might have a problem.

This is because those functions probably don't do what you think they do.

So go ack --python '[lr]strip' your codebase now.

What you think it does

If you haven't been bitten by this before, ventolin hfa compared to proventil proair, and you haven't thoroughly read help(str.rstrip), Ventolin inhailer generic, you probably think rstrip will strip a sequence of bytes off the end of a string.

For example, it could be used to get rid of a file extension, ventolin uk, like

>>> filename = "fumble.exe" >>> basefn = filename.rstrip(".exe")

Bzzzt. Ventolin dosages, Wrong.

What it actually does

As per the docstring:

rstrip(...)
S.rstrip([chars]) -> string or unicode

Return a copy of the string S with trailing whitespace removed, ventolin mexico.
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Pay attention here: characterS. Plural. Not a sequence, ventolin hfa inhalers. Ventolin mexico, More like a list.

Now, Trade name for the drug ventolin, have a look at our previous example, removing the extension.

>>> filename = "fumble.exe" >>> basefn = filename.rstrip(".exe") >>> basefn 'fumbl'

Not what you expected, aphex twin ventolin video edit audio, eh. Buy ventolin, Problem here is that it treats '.exe' as a list of characters, so it's basically this:

>>> remove_chars = [ '.', 'e', adrenaline vs ventolin, 'x', Ventolin is used for, 'e' ] >>> for char in reverse(filename): ... if char in remove_chars: ... # remove the char we're looking at .., ventolin mexico. else: .., ventolin hfa inhaler. break

Start at the end and go backwards, Ventolin contains ethanol, byte by byte.

If the character we're seeing is in the aforementioned list, remove it.

If not, we've reached a stop point, drugs ventolin, so process no further.

The opposite is of course true for lstrip. Isordil ventolin information,

What it is useful for

Once you get over the misleading behavior and come to terms with what it actually does, you can start discovering what it is useful for.

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This will remove both, ventolin hfc. They don't necessarily have to be in that order. Buy ventolin in central london,

What you probably wanted instead

OK, so having that out of the way, what would you want to get rid of a file extension, ventolin syrup otc or rx. replace(). Relion ventolin fha, replace() is perfect for this, because it takes a third optional argument:

replace(...)
S.replace (old, new[, buy ventolin no prescription, count]) -> string

Return a copy of string S with all occurrences of substring
old replaced by new. Ventolin nebulizer, If the optional argument count is
given, only the first count occurrences are replaced.

So lets try it again:

>>> filename = "fumble.exe" >>> basefn = filename.replace(".exe", ventolin hfa mechanical ventilator, "", 1) >>> basefn 'fumble'

Much better.

Written by jespern

March 8th, 2009 at 12:57 pm

Posted in python

Tagged with python

Albuterol Proventil Ventolin

without comments

Albuterol proventil ventolin, Something that isn't entirely clear from the use of Mercurial, is how to un-add a file you accidentally added, before you commit.

$ hg add data/ adding data/index.txt adding data/README adding data/hugefile.db

$ hg status A data/index.txt A data/README A data/hugefile.db

Oops, ventolin mdi and concentration. Is ventolin safe in pregnancy, Didn't want to add 'hugefile.db'. How to undo that add, ventolin tabs. Ventolin consumer concerns, $ hg revert data/hugefile.db

Did that do the right thing.

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$ hg status A data/index.txt A data/README . data/hugefile.db

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Written by jespern

March 2nd, 2009 at 10:04 am

Posted in hg

Tagged with hg, mercurial

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