Help: C char bits operations to python converting

[gangli at msn.com]

How could I convert following C statments to Python?
   char tmp_ch, tmp_ch0, tmp_ch1;
   tmp_ch = 'K' - 'A';          /* -> 10 */
   tmp_ch0 = ('N' - 'A') << 4;  /* -> -48 */
   tmp_ch1 = tmp_ch+ tmp_ch0;   /* -> -38 */
   tmp_ch = ~tmp_ch1;           /* -> -37 */
   tmp_ch = tmp_ch^2;           /* -> -39 */


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