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POPython: some newbie questions on sys.stderr and using function as argument
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  1. POPython: some newbie questions on sys.stderr and using function as argument
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    copied!<p>I'm just starting on Python and maybe I'm worrying too much too soon, but anyways...</p> <pre><code>log = "/tmp/trefnoc.log" def logThis (text, display=""): msg = str(now.strftime("%Y-%m-%d %H:%M")) + " TREfNOC: " + text if display != None: print msg + display logfile = open(log, "a") logfile.write(msg + "\n") logfile.close() return msg def logThisAndExit (text, display=""): msg = logThis(text, display=None) sys.exit(msg + display) </code></pre> <p><strong>That is working</strong>, but I don't like how it looks. Is there a better way to write this (maybe with just 1 function) and is there <a href="https://stackoverflow.com/questions/983201/python-and-sys-argv">any other thing</a> <em>I should be concerned under exiting</em>?</p> <hr> <p>Now to some background (but not about <a href="http://code.google.com/p/trefnoc/" rel="nofollow noreferrer">trefnoc</a>)...</p> <p>Sometimes I will call <code>logThis</code> just to log and display. Other times I want to call it and exit. Initially I was doing this:</p> <pre><code>logThis ("ERROR. EXITING") sys.exit() </code></pre> <p>Then I figured that wouldn't properly set the <code>stderr</code>, thus the current code shown on the top.</p> <p>My first idea was actually passing "sys.exit" as an argument, and defining just <code>logThis ("ERROR. EXITING", call=sys.exit)</code> defined as following (showing just the relevant differenced part):</p> <pre><code>def logThis (text, display="", call=print): msg = str(now.strftime("%Y-%m-%d %H:%M")) + " TREfNOC: " + text call msg + display </code></pre> <p>But that obviously didn't work. I think Python doesn't store functions inside variables. I couldn't (<em>quickly</em>) find anywhere if Python can have <em>variables taking functions</em> or not! Maybe using an <code>eval</code> function? I really always try to avoid them, tho. Sure I thought of using <code>if</code> instead of another <code>def</code>, but that wouldn't be any better or worst.</p> <p>Anyway, any thoughts?</p>
 

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