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copied!<p>First understand why shebang is needed -<br> Using a shebang lets the system know which command to use to run the script.</p> <p>What does that mean?<br> It means when you simply execute your script like this in the terminal - </p> <pre><code>$ ./script.py </code></pre> <p>"script.py" is given as an argument to the command you have mentioned in the commandline.</p> <p>So, if the shebang points to the python interpreter, the above command would be equivalent to this -</p> <pre><code>$ python script.py </code></pre> <p>So now you can understand the purpose of shebang - It just gives the path of the script interpreter. (in your case, the python interpreter).</p> <p>Note, that shebang is meaningless if you execute your script like this - </p> <pre><code>$ python script.py </code></pre> <p>(This is because you are calling the python executable and passing script.py as the first argument and it simply ignores the first line as it is a comment for it.)</p> <p>So, coming to your problem now - If you have two python installations and you want to execute your script using the non default python installation, what you do is either -<br> 1. simply execute as <code>$ /opt/bin/python script.py</code> and ignore the shebang.<br> OR<br> 2. Change <code>script.py</code>'s shebang you can and then you can execute as <code>./script.py</code></p> <p>I would choose the 1st option if I had to run <code>script.py</code> just once, and the 2nd one if I had to execute it many times (so I don't waste time writing <code>/opt/bin/python</code> every time)</p>

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