Exceptions & missing Python modules

exception crappy._global.CameraPrepareError

Error raised by a Camera when one of its children processes crashes while preparing.

exception crappy._global.CameraRuntimeError

Error raised by a Camera when one of its children processes crashes while running.

exception crappy._global.CrappyFail

Exception raised when an unexpected Exception is caught in Crappy. Also raised when all the Blocks do not terminate gracefully.

exception crappy._global.DefinitionError(msg: str)

Exception raised when trying to define an object with the same name as an already-defined one.

exception crappy._global.GeneratorStop

Exception raised when a Generator Block reaches the end of its Path.

exception crappy._global.LinkDataError

Exception raised when trying to send a wrong data type through a Link.

exception crappy.tool.image_processing.video_extenso.LostSpotError

Exception raised when a spot is lost, or when there’s too much overlapping.

exception crappy._global.PrepareError

Error raised in a Block when waiting for all Blocks to be ready but another Block fails to prepare.

exception crappy._global.ReaderStop

Exception raised when a FileReader Camera has exhausted all the images to read.

exception crappy._global.StartTimeout

Exception raised when the start event takes too long to be set.

exception crappy._global.T0NotSetError

Exception raised when requesting the t0 value when it is not set.

class crappy._global.OptionalModule(module_name: str, message: str | None = None, lazy_import: bool = False)

Placeholder for optional dependencies that are not installed.

Will display a message and raise an error when trying to use them.

__init__(module_name: str, message: str | None = None, lazy_import: bool = False) → None

Sets the arguments.

Parameters:

• module_name – The name of the module s a str, preferably the one invoked with pip install.

• message – Optionally, the message to display in case the module is missing (as a str). If not provided, a generic message will be displayed.

• lazy_import – If True, the module won’t be imported directly even if it is installed. In stead, it will be imported only when necessary. Allows reducing the import time, especially on Window.

__getattr__(attr: str) → Any

Method normally raising an exception indicating that the module is missing.

In case the lazy_import argument was set to True, still tries to get the desired attribute and raises the exception only if the module is missing.

__call__(*_, **__) → NoReturn

Method raising an exception indicating that the module is missing.