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Okay so here it goes! I followed the solution by @E1000ii given here and it worked

I am copy-pasting my changed code, based on the solution provided above:

28     def callbackDepth(self, data):
 29         print "all is well"
 30         try:
 31           NewImg = self.CvImg.imgmsg_to_cv2(data,"passthrough")
 32           depth_array = np.array(NewImg, dtype=np.float32)
 33           cv2.normalize(depth_array, depth_array, 0, 1, cv2.NORM_MINMAX)
 34           print data.encoding
 35           print
 36           cv2.imwrite("depth.png", depth_array*255)                                       
 37         except CvBridgeError as e:
 38           print(e)

Okay so here it goes! I followed the solution by @E1000ii given here and it worked

I am copy-pasting my changed code, based on the solution provided above:

28     def callbackDepth(self, data):
 29         print "all is well"
 30         try:
 31           NewImg = self.CvImg.imgmsg_to_cv2(data,"passthrough")
 32   self.CvImg.imgmsg_to_cv2(data, "passthrough")
        depth_array = np.array(NewImg, dtype=np.float32)
 33           cv2.normalize(depth_array, depth_array, 0, 1, cv2.NORM_MINMAX)
 34           print data.encoding
 35           print
 36           cv2.imwrite("depth.png", depth_array*255)                                       
 37     depth_array*255)
    except CvBridgeError as e:
 38           print(e)