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    <p>Depending on how flexible you want to have your Python script, I would structure the script like so:</p> <pre><code>def get_args(): # logic for parsing arguments here # return e.g. a dictionary def your_method(arg1=None,arg2=...): # further logic if __name__ == "__main__": args = get_args() your_method(**args) </code></pre> <p>There are various modules to parse command line arguments. Have a look at <a href="http://docs.python.org/dev/library/argparse.html" rel="nofollow noreferrer"><code>argparse</code></a> (easier) and <a href="http://docs.python.org/library/optparse.html" rel="nofollow noreferrer"><code>optparse</code></a>.</p> <p>If you just need a simple way to access the command line arguments, you can go with <a href="http://docs.python.org/library/sys.html#sys.argv" rel="nofollow noreferrer"><code>sys.argv</code></a>.</p> <p>With this separation you are also able to import your function into other code.</p> <p>Example:</p> <pre><code>import sys def get_args(): word = sys.argv[1] if (len(sys.argv) &gt; 1) else '' return {"word": word} def your_method(word=''): for i in range(len(word)): print word[i:] + word[:i], (word[i:] + word[:i])[::-1] if __name__ == "__main__": args = get_args() your_method(**args) </code></pre> <p>and run it with</p> <pre><code>python yourscript.py someword </code></pre> <hr> <p><strong>See also:</strong></p> <ul> <li><a href="https://stackoverflow.com/questions/567879/how-can-i-process-command-line-arguments-in-python">How can I process command line arguments in Python?</a></li> <li><a href="https://stackoverflow.com/questions/419163/what-does-if-name-main-do">What does <code>if __name__=="__main__":</code> do?</a></li> </ul>
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