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copied!<p>Here's a quick and dirty example of how a class could fire different versions of a save method depending on which operating system it's being executed on using <code>getattr()</code>.</p> <pre><code>import os class Log(object): def __init__(self): self.os = os.name def __getattr__(self, name): """ look for a 'save' attribute, or just return whatever attribute was specified """ if name == 'save': try: # try to dynamically return a save # method appropriate for the user's system return getattr(self, self.os) except: # bail and try to return # a default save method return getattr(self, '_save') else: return getattr(self, name) # each of these methods could have save logic specific to # the system on which the script is executed def posix(self): print 'saving on a posix machine' def nt(self): print 'saving on an nt machine' def os2(self): print 'saving on an os2 machine' def ce(self): print 'saving on a ce machine' def java(self): print 'saving on a java machine' def riscos(self): print 'saving on a riscos machine' def _save(self): print 'saving on an unknown operating system' def which_os(self): print os.name </code></pre> <p>Now let's use this class in an example:</p> <pre><code>logger = Log() # Now you can do one of two things: save_func = logger.save # and execute it, or pass it along # somewhere else as 1st class: save_func() # or you can just call it directly: logger.save() # other attributes will hit the else # statement and still work as expected logger.which_os() </code></pre>

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