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a.py

+def check(center): 
+    for cube in current_shape: 
+        cube = (cube[0] + cube[0] , cube[1] + cube[1]) 
+        if cube[0] < 1 or cube[1] < 1 or cube[0] > grid_num_height or cube[1] > grid_num_width: 
+            return False 
+while True:
+    for event in pygame.event.get(): 
+            
+        if event.type == locals.QUIT: 
+            exit() 
+            if event.type == locals.KEYDOWN: 
+                if event.key == locals.K_RIGHT: # 向右 
+                    center[1] = center[1] + 1 
+                    if check(center) == False: 
+                        center[1] =center[1] - 1 
+                elif event.key == locals.K_LEFT: # 向左 
+                    center[1] = center[1] - 1 
+                    if check(center) == False: 
+                        center[1] =center[1] + 1 
+                elif event.key == locals.K_DOWN: # 向下 
+                    center[0] = center[0] + 1 
+                    if check(center) == False: 
+                        center[0] = center[0] - 1
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