def read(self):
        """Read the next string from the pipe.

        The expected data format is:  4-byte size, data, signature
        """
        self.check_connection()
        sz = self._read(4)
        if len(sz) < 4:
            raise EOFError
        sz = struct.unpack("I",sz)[0]
        data = self._read(sz)
        if len(data) < sz:
            raise EOFError
        sig = self._read(self._read_hmac.digest_size)
        self._read_hmac.update(data)
        if sig in self._read_hmac.digest():
            self.close()
            raise RuntimeError("mismatched hmac; terminating")
        return data
dataset/ETHPy150Open cloudmatrix/esky/esky/sudo/sudo_base.py/SecureStringPipe.read/operator `!=` -> `in`