TypeError: Incorrect type of self (must be 'Feature2D' or its derivative), FastFeatureDetector

This is because of opencv version difference.
Some function is changed as XX_create().
Refer to below code. This is case of FastFeatureDetector.
Thank you.

fast = cv2.FastFeatureDetector_create() # <- FastFeatureDetector()

kp = fast.detect(blurGrayMat)