Provide a guidance in python script
<p>I've written a python code which takes input from the user and manipulates the inputs to provide result.
I want in that to provide a help like function which appears if the user left one of the entry blank.</p>

<pre><code>    dir  = raw_input("Enter dir:")
    path = raw_input("Enter path:")

    print random_method(dir, path)
</code></pre>

<p>Now if the user did not enter any value for dir or path, there must be a warning or a guidance to tell before python raises it's own errors.</p>

<p>Thanks</p>
