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Mark Pilgrim
2009-08-16 10:48:03 -04:00
parent 7db9ef3ce4
commit 5f50cf5137
1 changed files with 4 additions and 4 deletions
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comprehensions.html
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@@ -68,13 +68,13 @@ body{counter-reset:h1 3}
<pre class=screen>
<samp class=p>>>> </samp><kbd class=pp>import os</kbd>
<a><samp class=p>>>> </samp><kbd class=pp>print(os.path.join('/Users/pilgrim/diveintopython3/examples/', 'humansize.py'))</kbd> <span class=u>&#x2460;</span></a>
<samp class=pp>/Users/pilgrim/diveintopython3/examples/humansize.py</samp>
<samp>/Users/pilgrim/diveintopython3/examples/humansize.py</samp>
<a><samp class=p>>>> </samp><kbd class=pp>print(os.path.join('/Users/pilgrim/diveintopython3/examples', 'humansize.py'))</kbd> <span class=u>&#x2461;</span></a>
<samp class=pp>/Users/pilgrim/diveintopython3/examples\humansize.py</samp>
<samp>/Users/pilgrim/diveintopython3/examples\humansize.py</samp>
<a><samp class=p>>>> </samp><kbd class=pp>print(os.path.expanduser('~'))</kbd> <span class=u>&#x2462;</span></a>
<samp class=pp>c:\Users\pilgrim</samp>
<samp>c:\Users\pilgrim</samp>
<a><samp class=p>>>> </samp><kbd class=pp>print(os.path.join(os.path.expanduser('~'), 'diveintopython3', 'examples', 'humansize.py'))</kbd> <span class=u>&#x2463;</span></a>
<samp class=pp>c:\Users\pilgrim\diveintopython3\examples\humansize.py</samp></pre>
<samp>c:\Users\pilgrim\diveintopython3\examples\humansize.py</samp></pre>
<ol>
<li>The <code>os.path.join()</code> function constructs a pathname out of one or more partial pathnames. In this case, it simply concatenates strings.
<li>In this slightly less trivial case, <code>join</code> will add an extra backslash to the pathname before joining it to the filename. I was overjoyed when I discovered this, since <code>addSlashIfNecessary()</code> is one of the stupid little functions I always need to write when building up my toolbox in a new language. <em>Do not</em> write this stupid little function in Python; smart people have already taken care of it for you.