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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.
If chars is given and not None, remove characters in chars instead, ventolin inhaler coupons.
If chars is unicode, Relion ventolin inhaler, S will be converted to unicode before stripping

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


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


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


3. 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.

For example, ventolin nebulizer solution, it's immensely useful for stripping leading or trailing whitespace. Ventolin mexico, In fact, this is such a common use-case that this is what it does if you don't specify any arguments. Use ventolin with spacer, Since it's a list of characters, in cases where you need to remove both unix-style carriage returns as well as win32 ones, you can simply do:


block_of_text.rstrip("\r\n")


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.

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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.


$ ls data/hugefile.db # still there, ventolin inhalation aerosol. Ventolin tablet, data/hugefile.db

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


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