Pass variable by reference

[Satish Muthali]

Hello experts,

I have a burning question on how to pass variable by reference in Python. I 
understand that  the data type has to be mutable.

For example, here’s the issue I am running in to:

I am trying to extract the PostgreSQL DB version for example:

pgVer = [s.split() for s in os.popen("psql --version").read().splitlines()]
    print pgVer[0]
    for i, var in enumerate(pgVer[0]):
            if i == len(pgVer[0]) - 1:
                    pgversion = var

I would now like to pass ‘pgversion’ (where the value of pgversion is 9.3.4) by 
reference, for example:

I want to nuke /var/lib/postgresql/9.3.4/main/data , however programatically I 
want it to be as:  /var/lib/postgresql/<value of pgversion>/main/data

Any help is appreciated.

Thanks
Satish
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