#!/usr/bin/python

def join(li):
    nli = [ x.replace('\\', '\\\\') for x in li ]
    nli = [ x.replace('/',  '\\/')  for x in nli ]
    return '/'.join(nli)

def split(st):
    li = st.split('/')
    nli = [li[0]]
    for x in li[1:]:
        bscount = 0
        if nli[-1]:
            while nli[-1][-1 - bscount] == '\\': bscount += 1
        if bscount % 2:
            nli[-1] = nli[-1][:-1] + '/' + x
        else:
            nli.append(x)
    nli = [ x.replace('\\\\', '\\') for x in nli ]
    return nli

if __name__ == '__main__':
    orig = ['foo', 'bar/baz\\/', '', 'st\\\\uff']
    print ':'.join(orig)
    a = join(orig)
    print a
    b = split(a)
    print ':'.join(b)