Fetch SVN revision number

def fetchrev(svndir):
    '''Define svndir. Assuming SVN is installed. SVN commands should be the same crossplatform'''
    from subprocess import check_output
    svncmd = "svn info --revision HEAD " + svndir ## Space needed
    revision = check_output(svncmd).split() ## Make list
    revnum = revision.index("Revision:") + 1
    return revision[revnum]