sum of two numbers coming from the command line
<p>I know it's a very basic program but I am getting an error of list out of range. Here is the program to take two numbers as command-line arguments (while invoking the script) and display sum (using python):</p>

<pre><code>import sys
a= sys.argv[1]
b= sys.argv[2]
sum=str( a+b)
print " sum is", sum
</code></pre>
