OpenCV Version Conditionals

check_opencv.py

# https://www.pyimagesearch.com/2015/08/10/checking-your-opencv-version-using-python/

def is_cv2():
    return check_opencv_version("2.")

def is_cv3():
    return check_opencv_version("3.")

def is_cv4():
    return check_opencv_version("4.")

def check_opencv_version(major, lib=None):
    if lib is None:
        import cv2 as lib

    return lib.__version__.startswith(major)

if is_cv2():
    print("CV 2")
if is_cv3():
    print("CV 3")
if is_cv4():
    print("CV 4")
    
    
# https://stackoverflow.com/a/54703223
if cv2.check_opencv_version() in [2, 4]:
    # OpenCV 2, OpenCV 4
    contour, hier = cv2.findContours(
                    thresh.copy(), cv2.RETR_CCOMP, cv2.CHAIN_APPROX_NONE)
else:
    # OpenCV 3
    image, contour, hier = cv2.findContours(
                    thresh.copy(), cv2.RETR_CCOMP, cv2.CHAIN_APPROX_NONE)