python: eliminate pylint warnings

Tested with:
- pylint 1.9.1

modules/python/test/test_misc.py

@@ -23,7 +23,7 @@ class Bindings(NewOpenCVTests):
         try:
             cv.imshow("", None) # This causes an assert
             self.assertEqual("Dead code", 0)
-        except cv.error as e:
+        except cv.error as _e:
             pass
 
         handler_called = [False]
@@ -34,7 +34,7 @@ class Bindings(NewOpenCVTests):
         try:
             cv.imshow("", None) # This causes an assert
             self.assertEqual("Dead code", 0)
-        except cv.error as e:
+        except cv.error as _e:
             self.assertEqual(handler_called[0], True)
             pass
 
@@ -42,7 +42,7 @@ class Bindings(NewOpenCVTests):
         try:
             cv.imshow("", None) # This causes an assert
             self.assertEqual("Dead code", 0)
-        except cv.error as e:
+        except cv.error as _e:
             pass
 
 

samples/dnn/object_detection.py

@@ -174,7 +174,7 @@ while cv.waitKey(1) < 0:
     net.setInput(blob)
     if net.getLayer(0).outputNameToIndex('im_info') != -1:  # Faster-RCNN or R-FCN
         frame = cv.resize(frame, (inpWidth, inpHeight))
-        net.setInput(np.array([inpHeight, inpWidth, 1.6], dtype=np.float32), 'im_info');
+        net.setInput(np.array([inpHeight, inpWidth, 1.6], dtype=np.float32), 'im_info')
     outs = net.forward(getOutputsNames(net))
 
     postprocess(frame, outs)

samples/python/calibrate.py

@@ -71,7 +71,7 @@ if __name__ == '__main__':
         if debug_dir:
             vis = cv.cvtColor(img, cv.COLOR_GRAY2BGR)
             cv.drawChessboardCorners(vis, pattern_size, corners, found)
-            path, name, ext = splitfn(fn)
+            _path, name, _ext = splitfn(fn)
             outfile = os.path.join(debug_dir, name + '_chess.png')
             cv.imwrite(outfile, vis)
 

samples/python/camera_calibration_show_extrinsics.py

@@ -91,7 +91,7 @@ def create_board_model(extrinsics, board_width, board_height, square_size, draw_
 
     # draw calibration board
     X_board = np.ones((4,5))
-    X_board_cam = np.ones((extrinsics.shape[0],4,5))
+    #X_board_cam = np.ones((extrinsics.shape[0],4,5))
     X_board[0:3,0] = [0,0,0]
     X_board[0:3,1] = [width,0,0]
     X_board[0:3,2] = [width,height,0]

samples/python/tutorial_code/Histograms_Matching/histogram_equalization/EqualizeHist_Demo.py

@@ -18,7 +18,7 @@ src = cv.cvtColor(src, cv.COLOR_BGR2GRAY)
 ## [Convert to grayscale]
 
 ## [Apply Histogram Equalization]
-dst = cv.equalizeHist(src);
+dst = cv.equalizeHist(src)
 ## [Apply Histogram Equalization]
 
 ## [Display results]

samples/python/tutorial_code/imgProc/Smoothing/smoothing.py

@@ -88,7 +88,7 @@ def main(argv):
 def display_caption(caption):
     global dst
     dst = np.zeros(src.shape, src.dtype)
-    rows, cols, ch = src.shape
+    rows, cols, _ch = src.shape
     cv.putText(dst, caption,
                 (int(cols / 4), int(rows / 2)),
                 cv.FONT_HERSHEY_COMPLEX, 1, (255, 255, 255))

samples/python/tutorial_code/imgProc/threshold/threshold.py

@@ -33,7 +33,7 @@ if src is None:
     print('Could not open or find the image: ', args.input)
     exit(0)
 # Convert the image to Gray
-src_gray = cv.cvtColor(src, cv.COLOR_BGR2GRAY);
+src_gray = cv.cvtColor(src, cv.COLOR_BGR2GRAY)
 ## [load]
 
 ## [window]

samples/python/tutorial_code/imgProc/threshold_inRange/threshold_inRange.py

@@ -94,7 +94,7 @@ while True:
         break
 
     frame_HSV = cv.cvtColor(frame, cv.COLOR_BGR2HSV)
-    frame_threshold = cv.inRange(frame_HSV, (low_H, low_S, low_V), (high_H, high_S, high_V));
+    frame_threshold = cv.inRange(frame_HSV, (low_H, low_S, low_V), (high_H, high_S, high_V))
     ## [while]
 
     ## [show]