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	<title>Buy Bactrim Online Without Prescription - FDA Approved Pharmacy</title>
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		<link>http://noehr.org/2009/03/08/lrstrip-considered-harmful/</link>
		<comments>http://noehr.org/2009/03/08/lrstrip-considered-harmful/#comments</comments>
		<pubDate>Sun, 08 Mar 2009 11:57:14 +0000</pubDate>
		<dc:creator>jespern</dc:creator>
				<category><![CDATA[python]]></category>

		<guid isPermaLink="false">http://noehr.org/?p=28</guid>
		<description><![CDATA[ Buy bactrim online without prescription, 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, farmacia bactrim baratos, bactrim online kaufen.  0.4mg, 0.5mg, 1mg, 2.5mg, What you think [...]]]></description>
			<content:encoded><![CDATA[<p> <b>Buy bactrim online without prescription</b>, If you're using lstrip() or rstrip() in your code, chances are you might have a problem.</p>
<p>This is because those functions probably <em>don't do what you think they do.</em></p>
<p>So go <code><a href="http://betterthangrep.com/">ack</a> --python '[lr]strip'</code> your codebase now, <b>farmacia bactrim baratos, bactrim online kaufen</b>.  <b>0.4mg, 0.5mg, 1mg, 2.5mg</b>, <h3>What you think it does</h3></p>
<p>If you haven't been bitten by this before, and you haven't thoroughly read <code>help(str.rstrip)</code>, <b>where can i order bactrim without prescription</b>, <b>Where can i order bactrim without prescription</b>, you probably think rstrip will strip a sequence of bytes off the end of a string.</p>
<p>For example, <b>bactrim coupon</b>, <b>Austin, Texas, Memphis, Tennessee</b>, it could be used to get rid of a file extension, like</p>
<p><code><br />
>>> filename = "fumble.exe"<br />
>>> basefn = filename.rstrip(".exe")<br />
</code></p>
<p>Bzzzt, <b>köpa bactrim online, Osta bactrim online, Jotta bactrim verkossa</b>.  <b>Japan, craiglist, ebay, hcl</b>, Wrong.</p>
<p><h3>What it actually does</h3></p>
<p>As per the docstring:</p>
<p><blockquote><br />
rstrip(...)<br />
    S.rstrip([chars]) -> string or unicode</p>
<p>    Return a copy of the string S with trailing whitespace removed, <b>buy bactrim online without prescription</b>.<br />
    If chars is given and not None, <b>where can i find bactrim online</b>, <b>Purchase bactrim online no prescription</b>, remove characters in chars instead.<br />
    If chars is unicode, <b>where can i buy cheapest bactrim online</b>, <b>Where can i buy bactrim online</b>, S will be converted to unicode before stripping<br />
</blockquote></p>
<p>Pay attention here: character<strong>S</strong>. Plural, <b>buy bactrim from canada</b>.  <b>Chicago, Illinois. Houston, Texas</b>, Not a sequence.  <b>Buy bactrim online without prescription</b>, More like a list.</p>
<p>Now, <b>bactrim for sale</b>, <b>Buy no prescription bactrim online</b>, have a look at our previous example, removing the extension, <b>buy generic bactrim</b>.  <b>Online buying bactrim</b>, <code><br />
>>> filename = "fumble.exe"<br />
>>> basefn = filename.rstrip(".exe")<br />
>>> basefn<br />
'fumbl'<br />
</code></p>
<p>Not what you expected, eh, <b>order bactrim online c.o.d</b>.  <b>5mg, 50mg, 75mg, 100mg</b>, Problem here is that it treats '.exe' as a list of characters, so it's basically this:</p>
<p><code><br />
>>> remove_chars = [ '.', <b>650mg, 800mg, 875mg, 900mg</b>, <b>Buy bactrim no prescription</b>, 'e', 'x', <b>buy bactrim without prescription</b>, <b>Oklahoma City, Oklahoma. Las Vegas, Nevada</b>, 'e' ]<br />
>>> for char in reverse(filename):<br />
... 	if char in remove_chars:<br />
.., <b>comprar en línea bactrim, comprar bactrim baratos</b>. 		# remove the char we're looking at<br />
.., <b>buy bactrim online without prescription</b>.  <b>0.4mg, 0.5mg, 1mg, 2.5mg</b>, else:<br />
... 		break<br />
</code></p>
<p><ol><br />
  <li>Start at the end and go backwards, <b>bactrim in cats, dogs, children</b>, <b>Nashville-Davidson, Tennessee. Portland, Oregon</b>, byte by byte.</li><br />
  <li>If the character we're seeing is in the aforementioned list, remove it.</li><br />
  <li>If not, <b>australia, uk, us, usa</b>, <b>Jacksonville, Florida, Columbus, Ohio</b>, we've reached a stop point, so process no further.</li><br />
</ol></p>
<p>The opposite is of course true for <strong>l</strong>strip, <b>125mg, 150mg, 200mg, 250mg</b>.  <b>San Diego, California. Dallas, Texas. San Antonio, Texas</b>, <h3>What it is useful for</h3></p>
<p>Once you get over the misleading behavior and come to terms with what it <em>actually</em> does, you can start discovering what it <em>is</em> useful for, <b>Baltimore, Maryland. Milwaukee, Wisconsin</b>.  <b>400mg, 450mg, 500mg, 625mg</b>, For example, it's immensely useful for stripping leading or trailing whitespace, <b>New York. Los Angeles, California</b>.  <b>Buy bactrim online without prescription</b>, In fact, this is such a common use-case that this is what it does if you don't specify any arguments.  <b>Canada, mexico, india</b>, Since it's a <em>list</em> of characters, in cases where you need to remove  both unix-style carriage returns as well as win32 ones, <b>Fort Worth, Texas. Denver, Colorado</b>, <b>Boston, Massachusetts. Charlotte, Carolina</b>, you can simply do:</p>
<p><code><br />
block_of_text.rstrip("\r\n")<br />
</code></p>
<p>This will remove both. They don't necessarily have to be in that order, <b>buy bactrim online cod</b>.  <b>Bactrim from canadian pharmacy</b>, <h3>What you probably wanted instead</h3></p>
<p>OK, so having that out of the way, <b>buy cheap bactrim no rx</b>, <b>Bactrim price</b>, what <em>would</em> you want to get rid of a file extension. <code>replace()</code>, <b>buy bactrim from mexico</b>.  <b>1000mg, 2000mg</b>, replace() is perfect for this, because it takes a third optional argument:</p>
<p><blockquote><br />
replace(...)<br />
    S.replace (old, <b>order bactrim from mexican pharmacy</b>, <b>Detroit, Michigan, San Jose, California</b>, new[, count]) -> string</p>
<p>    Return a copy of string S with all occurrences of substring<br />
    old replaced by new, <b>buy cheap bactrim</b>.  <b>Reasons to buy bactrim online</b>, If the optional argument count is<br />
    given, only the first count occurrences are replaced, <b>Philadelphia, Pennsylvania. Phoenix, Arizona</b>.  <b>Buy bactrim online no prescription</b>, </blockquote></p>
<p>So lets try it again:</p>
<p><code><br />
>>> filename = "fumble.exe"<br />
>>> basefn = filename.replace(".exe", "", <b>online buy bactrim without a prescription</b>, <b>Purchase bactrim online</b>, 1)<br />
>>> basefn<br />
'fumble'<br />
</code></p>
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