12. API - Exceptions¶
All exceptions defined by picamera are listed in this section. All exception
classes utilize multiple inheritance in order to make testing for exception
types more intuitive. For example, PiCameraValueError
derives from both
PiCameraError
and ValueError
. Hence it will be caught by blocks
intended to catch any error specific to the picamera library:
try:
camera.brightness = int(some_user_value)
except PiCameraError:
print('Something went wrong with the camera')
Or by blocks intended to catch value errors:
try:
camera.contrast = int(some_user_value)
except ValueError:
print('Invalid value')
12.1. Warnings¶
-
exception
picamera.
PiCameraDeprecated
[source]¶ Raised when deprecated functionality in picamera is used.
-
exception
picamera.
PiCameraFallback
[source]¶ Raised when picamera has to fallback on old functionality.
12.2. Exceptions¶
-
exception
picamera.
PiCameraValueError
[source]¶ Raised when an invalid value is fed to a
PiCamera
object.
-
exception
picamera.
PiCameraRuntimeError
[source]¶ Raised when an invalid sequence of operations is attempted with a
PiCamera
object.
-
exception
picamera.
PiCameraClosed
[source]¶ Raised when a method is called on a camera which has already been closed.
-
exception
picamera.
PiCameraNotRecording
[source]¶ Raised when
stop_recording()
orsplit_recording()
are called against a port which has no recording active.
-
exception
picamera.
PiCameraAlreadyRecording
[source]¶ Raised when
start_recording()
orrecord_sequence()
are called against a port which already has an active recording.
12.3. Functions¶
-
picamera.
mmal_check
(status, prefix='')[source]¶ Checks the return status of an mmal call and raises an exception on failure.
The status parameter is the result of an MMAL call. If status is anything other than MMAL_SUCCESS, a
PiCameraMMALError
exception is raised. The optional prefix parameter specifies a prefix message to place at the start of the exception’s message to provide some context.