In AAA directory do yourself a module_a. Py library, a OS in the module_a. Getced (), now has a module_b in BBB directory library, import module_a, module_b invokes the module_a OS. In the getcwd (), returns is the path of the BBB, is there any way possible to return to the path of the AAA? OS. Except chdir (path) method, because I want to give the other people's computer use, career as a bank's financial, self-study non-professional, strives for the bosses to give directions, thank you

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Is anyone here, guidance, newbie on the road