Expose Python exceptions in public module

[Simske]

Description

The deltalake-Python module defines multiple exceptions which can be raised when working with the package (DeltaError, TableNotFoundError, CommitFailedError, DeltaProtocolError). However these exceptions are defined only in the "private" deltalake._internal submodule, and not in the root module or a public submodule.

As I don't expect the interface of ._internal to be stable it would be useful to expose them in a public module with a stable interface.

My suggestion would be to either:

• expose them via the root module
• expose them in dedicated public submodule exceptions

I'm happy to open a PR for this.

Use Case

The user needs to import the exceptions if they want to do speficic exception handling, e.g.

try:
    table = deltalake.DeltaTable(table_uri)
except deltalake.exceptions.TableNotFoundError:
    logging.warning("Table '%s' not found, skipping", table_uri)

Related Issue(s)
None

[roeap]

I'm happy to open a PR for this.

@Simske, that would be great. The exceptions were actually meant to be public :).

Personally I would go for the dedicated submodule approach.

[ion-elgreco]

@roeap I checked but they are already available under the exceptions module

[roeap]

well - even better :). @Simske, could you confirm that works for you?

[ion-elgreco]

I'm closing this since have it already in the exceptions module.

[Simske]

I'm not sure how I overlooked that - thank you.