FallbackContext

Context workaround.

The built-in @contextmanager utility does not work well when wrapping other contexts, as the traceback is wrong when the wrapped context raises.

Attributes

Attribute	Type	Description
provided	any	The existing resource or connection to be returned directly if it is not None.
fallback	callable	A callable that returns a context manager to be used if the provided resource is None.
fb_args	tuple	Positional arguments to be passed to the fallback callable when initializing the context.
fb_kwargs	dict	Keyword arguments to be passed to the fallback callable when initializing the context.
_context	any = None	Internal storage for the active context manager instance created by the fallback callable.

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Constructor

Signature

def FallbackContext(
    provided: Any,
    fallback: callable,
    *fb_args: tuple,
    **fb_kwargs: dict
) - > null

Parameters

Name	Type	Description
provided	Any	An existing value to be returned if it is not None.
fallback	callable	A callable that returns a context manager to be used if provided is None.
*fb_args	tuple	Positional arguments to pass to the fallback callable.
**fb_kwargs	dict	Keyword arguments to pass to the fallback callable.

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