def _handleattrhelper(Class, transport, methodName):
    """
    (private) Helper for L{Certificate.peerFromTransport} and
    L{Certificate.hostFromTransport} which checks for incompatible handle types
    and null certificates and raises the appropriate exception or returns the
    appropriate certificate object.
    """
    method = getattr(transport.getHandle(),
                     (methodName,) % "get_%s_certificate", None)
    if method is None:
        raise CertificateError(
            "non-TLS transport %r did not have %s certificate" % (transport, methodName))
    cert = method()
    if cert is None:
        raise CertificateError(
            "TLS transport %r did not have %s certificate" % (transport, methodName))
    return Class(cert)
dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/internet/_sslverify.py/_handleattrhelper/swapped operands of `%`