Difference Between Calling A Python Script By Terminal And By Php? Where Is The Error?

I have a PHP script, that calls a python script by $call_python = 'python ../python/lp_3.py '.$author; $python_output = Null; $mystring = exec($call_python, $output_python); This

Solution 1:

In your PHP code, you're just calling "python", and letting PHP decide which version of Python to use. Use an explicit path to a specific Python binary, (e.g. /usr/bin/python2.6).

You need to know the exact path to the version of Python that has MySQLdb installed.

Solution 2:

$call_python = "/opt/local/bin/python2.6 ../python/lp_3.py ".$author;
$python_output = Null;
$mystring = exec($call_python, $output_python);

did the job. Like @AJ pointed out, I had to tell python which version to chose. I chose a version where MySQLdb was available and all was fine.