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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def getreadergroups(self):
 """ Returns the list of smartcard reader groups."""

        innerreadergroups.getreadergroups(self)

        hresult, hcontext = SCardEstablishContext(SCARD_SCOPE_USER)
        if hresult != 0:
            raise EstablishContextException(hresult)
        hresult, readers = SCardListReaderGroups(hcontext)
        if hresult != 0:
            raise ListReadersException(hresult)
        hresult = SCardReleaseContext(hcontext)
        if hresult != 0:
            raise ReleaseContextException(hresult)
        return readers