Finding the relative path of a file from a dir

[Suresh Jeevanandam]

Hi,
        a = '/home/suresh/doc/html/a1/'
        b = '/home/suresh/doc/'

I am looking for a standard function which will return the location of b 
relative to a i.e. '../..'

        I have gone through the os and os.path modules, but could not find any 
function of use. Should I write my own?

Thanks in advance,
Suresh
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