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POHow to catch errors elegantly and keep methods clean?
 

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  1. POHow to catch errors elegantly and keep methods clean?
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    <p>I am in the process of writing a small(er) Python script to automate a semi-frequent, long, and error-prone task. This script is responsible for making various system calls - either though os.system or through os.(mkdir|chdir|etc).</p> <p>Here is an example of my code right now:</p> <pre><code>class AClass: def __init__(self, foo, bar, verbose=False, silent=False): # Sets up variables needed for each instance, etc self.redirect = '' if silent: self.redirect = '&gt; 2&gt;&amp;1' self.verbose = verbose def a_method(self): """ Responsible for running 4-6 things via system calls as described """ if self.verbose and not self.silent: print "Creating a directory" try: os.mkdir('foobar') except OSError, e: raise OSError, "Problem creating directory %s: %s" % (e.filename, e.strerror) if self.verbose and not self.silent: print "Listing a directory" if (os.system('ls foobar %s') % self.redirect) is not 0: raise OSError, "Could not list directory foobar" def b_method(self): """ Looks very similar to a_method() """ def run(self): """ Stitches everything together """ try: a_method() except OSError, e: print "a_method(): %s" % e.strerror sys.exit(-1) try: b_method() except OSError, e: print "b_method(): %s" % e.strerror sys.exit(-1) </code></pre> <p>Obviously writing all the <code>if self.verbose and not self.silent</code> is messy and then the <code>try/catch</code> or <code>if</code> around each call is ugly to look at. I would have liked to use Python's logging class and simply have one logging level (verbose) configurable via command line and then I can simple call <code>logger.debug('My message')</code> but I am using Python 2.2 and I do not have access to the <code>logging</code> class.</p> <p><strong>Summary/Base Questions</strong><br> I am using Python 2.2 and I cannot change this. I am running on an ESX 3.0.2 server and I cannot touch it in any other way for the time being.<br> What is the best way to handle error checking and verbose output without tying this logic to your class (which should only do One Thing)?<br> How can I reduce the clutter with something more simple or elegant to look at?</p> <p>Thanks!</p>
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