Disc space free within an application

File Handling example from a Well House Consultants training course
More on File Handling [link]

This example is described in the following article(s):
• Python - fresh examples from recent courses - [link]
• Running an operating system command from your Python program - the new way with the subprocess module - [link]

Source code: sys.py Module: Y110

""" This is an example in which we call a generic function of our
own - "getdiscspace" - which then calls different code depending on
the host operating system. This technique, known as "wrapping", means
that our main application can be operating system independent, even
though OS dependent code is being called internally """

from os import *
import re

def getdiscspace():

""" Wrapper to call in disc space
        code for the appropriate OS """

        if name == "nt":
                rv = getdiscspace_doze()
        else:
                rv = getdiscspace_ixux()
        return rv

def getdiscspace_ixux():

""" Disc space - Linux or Unix"""

        space = re.compile(r'\s+')
        ph = popen("df -k")

        retval = []
        lr = 0
        for result in ph.readlines():
                lr += 1
                if lr < 2:
                        continue
                fol = space.split(result.strip())
                if not fol[0].startswith('/'):
                        continue
                retval.append( [fol[0],fol[4],fol[5]] )

        return retval

if __name__ == "__main__":
        stuff = getdiscspace()
        print stuff

""" Sample Output:

wizard:pyoo graham$ python sys.py
[['/dev/disk0s2', '13%', '/'], ['/dev/disk1s2', '69%', '/Volumes/Skype']]
wizard:pyoo graham$

"""

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* Learning to program in Python
* Python Programming
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