Reverse and splice python tuple

code.py

""" About:
img is an OpenCV 2 object. img.shape prints a tuple as (height, width, channels) e.g. (512, 768, 3)
We need a tuple as (width, height) e.g. (768, 512)
"""

import cv2
image_path = './image.jpg'
img = cv2.imread(image_path, flags=cv2.CV_LOAD_IMAGE_COLOR)
print img.shape # (512, 768, 3)
print img.shape[::-1] # (3, 768, 512)

print img.shape[1::-1] # (768, 512)