supress numpy future warning with `None` comparison

samples/python/houghcircles.py

@@ -30,7 +30,7 @@ if __name__ == '__main__':
 
     circles = cv2.HoughCircles(img, cv2.HOUGH_GRADIENT, 1, 10, np.array([]), 100, 30, 1, 30)
 
-    if circles != None: # Check if circles have been found and only then iterate over these and add them to the image
+    if circles is not None: # Check if circles have been found and only then iterate over these and add them to the image
         a, b, c = circles.shape
         for i in range(b):
             cv2.circle(cimg, (circles[0][i][0], circles[0][i][1]), circles[0][i][2], (0, 0, 255), 3, cv2.LINE_AA)

samples/python/houghlines.py

@@ -36,7 +36,7 @@ if __name__ == '__main__':
 
     else:    # HoughLines
         lines = cv2.HoughLines(dst, 1, math.pi/180.0, 50, np.array([]), 0, 0)
-        if lines != None:
+        if lines is not None:
             a,b,c = lines.shape
             for i in range(a):
                 rho = lines[i][0][0]

samples/python/tst_scene_render.py

@@ -21,7 +21,7 @@ class TestSceneRender():
         self.deformation = deformation
         self.speed = speed
 
-        if bgImg != None:
+        if bgImg is not None:
             self.sceneBg = bgImg.copy()
         else:
             self.sceneBg = np.zeros(defaultSize, defaultSize, np.uint8)
@@ -29,7 +29,7 @@ class TestSceneRender():
         self.w = self.sceneBg.shape[0]
         self.h = self.sceneBg.shape[1]
 
-        if fgImg != None:
+        if fgImg is not None:
             self.foreground = fgImg.copy()
             self.center = self.currentCenter = (int(self.w/2 - fgImg.shape[0]/2), int(self.h/2 - fgImg.shape[1]/2))
 
@@ -52,7 +52,7 @@ class TestSceneRender():
 
     def getRectInTime(self, time):
 
-        if self.foreground != None:
+        if self.foreground is not None:
             tmp = np.array(self.center) + np.array((self.getXOffset(time), self.getYOffset(time)))
             x0, y0 = tmp
             x1, y1 = tmp + self.foreground.shape[0:2]
@@ -64,7 +64,7 @@ class TestSceneRender():
 
     def getCurrentRect(self):
 
-        if self.foreground != None:
+        if self.foreground is not None:
 
             x0 = self.currentCenter[0]
             y0 = self.currentCenter[1]
@@ -79,7 +79,7 @@ class TestSceneRender():
     def getNextFrame(self):
         img = self.sceneBg.copy()
 
-        if self.foreground != None:
+        if self.foreground is not None:
             self.currentCenter = (self.center[0] + self.getXOffset(self.time), self.center[1] + self.getYOffset(self.time))
             img[self.currentCenter[0]:self.currentCenter[0]+self.foreground.shape[0],
              self.currentCenter[1]:self.currentCenter[1]+self.foreground.shape[1]] = self.foreground