add function at the end, above __name__ == ... to run from command line

BaslerChangeParameter.py

@@ -25,7 +25,7 @@ if len(devices) == 0:
 
 # Create an array of instant cameras for the found devices and avoid exceeding a maximum number of devices. -> Output-> Pylon::CInstantCameraArray
 CAMERAS_ARRAY = pylon.InstantCameraArray(min(len(devices), MAX_CAMERAS_TO_USE))
-print(f'cameras: {CAMERAS_ARRAY}')
+# print(f'cameras: {CAMERAS_ARRAY}') # for debug
 
 l = CAMERAS_ARRAY.GetSize()
 
@@ -47,17 +47,13 @@ def listcams():
     for i, camera_instantz in enumerate(CAMERAS_ARRAY):
         # cam is an instance Swig object of type Pylon::CInstantCamera on cluster on HD
         camera_instantz.Attach(tlFactory.CreateDevice(devices[i]))
-        print(f'camInstatnt: {type(camera_instantz)}')
-
-    #
-    # list all the connected cameras at the system:
-    #
+        print(f'camera_instantz: {type(camera_instantz)}')
 
         # Print the serial number of the model of the camera. - by replacing .GetSerialNumber() with .GetModelName() outputs the Modelname
         cam_ids = camera_instantz.GetDeviceInfo().GetSerialNumber()
         print("Using device ", cam_ids)
 
-    return cam_ids
+    return cam_ids, camera_instantz
 
 # Open cameras:
 
@@ -243,6 +239,8 @@ def freeruncam():
 
 # ---> ongoing, not yet in usage.
 
+CAM_ID, CAM_INSTANT = listcams()
+
 if __name__ == '__main__':
     CAM_ID, CAM_INSTANT = listcams()
-    readcams()
+    # readcams()