NameError

# cv2.findCountours() function changed from OpenCV3 to OpenCV4: now it have only two parameters instead of 3

cv2MajorVersion = cv2.__version__.split(".")[0]

print('openCV version : ', cv2MajorVersion)

# check for contours on thresh

if int(cv2MajorVersion) >= 4:

    contours, hierarchy = cv2.findContours(thresh, cv2.RETR_LIST, cv2.CHAIN_APPROX_SIMPLE)

else:

    imageContours, contours, hierarchy = cv2.findContours(thresh, cv2.RETR_LIST, cv2.CHAIN_APPROX_SIMPLE)

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-9-5caa6544b17f> in <module>
      4 # check for contours on thresh
      5 if int(cv2MajorVersion) >= 4:
----> 6     contours, hierarchy = cv2.findContours(thresh, cv2.RETR_LIST, cv2.CHAIN_APPROX_SIMPLE)
      7 else:
      8     imageContours, contours, hierarchy = cv2.findContours(thresh, cv2.RETR_LIST, cv2.CHAIN_APPROX_SIMPLE)

NameError: name 'thresh' is not defined