Pus coming from hemorrhoidectomy site a week after the surgery, it it normal?

No. Pus or infection like drainage is never normal after surgery, seek medical evaluation and treatment immediately.
Maybe. Anal discharge and drainage can be normal after hemorrhoid surgery. If there is a lot of swelling, then you may need to call and see your surgeon soon. Soaking in warm bath 1 to 3 times a day may help, and avoid constipation and straining for bowel movements early after this surgery.