osxphotos REPL mode

[RhetTbull]

For those working on using osxphotos in your own code, I've added an osxphotos repl mode I find useful for debugging and experimenting. Running osxphotos repl (with optional --db /path/to/library) opens a python REPL (run/eval/print loop) with the photo library loaded. You can then run python code directly on the library to explore or test. For example:

$ osxphotos repl
python version: 3.9.5 (v3.9.5:0a7dcbdb13, May  3 2021, 13:17:02)
[Clang 6.0 (clang-600.0.57)]
osxphotos version: 0.42.54
Using last opened Photos library: /Users/rhet/Pictures/Test-10.15.7.photoslibrary
Loading database
Processing database /Users/rhet/Pictures/Test-10.15.7.photoslibrary/database/photos.db
Processing database /Users/rhet/Pictures/Test-10.15.7.photoslibrary/database/Photos.sqlite
Database locked, creating temporary copy.
Processing database.
Database version: 6000, 5.
Processing persons in photos.
Processing detected faces in photos.
Processing albums.
Processing keywords.
Processing photo details.
Processing import sessions.
Processing additional photo details.
Processing face details.
Processing photo labels.
Processing EXIF details.
Processing computed aesthetic scores.
Processing comments and likes for shared photos.
Done processing details from Photos library.
Done: took 0.15 seconds
Getting photos
Found 25 photos in 0.01 seconds
The following variables are defined:
- photosdb: PhotosDB() instance for /Users/rhet/Pictures/Test-10.15.7.photoslibrary
- photos: list of PhotoInfo objects for all photos in photosdb, including those in the trash

The following functions may be helpful:
- get_photo(uuid): return a PhotoInfo object for photo with uuid
- get_selected(): return list of PhotoInfo objects for photos selected in Photos
- show(photo): open a photo object in the default viewer
- help(object): print help text including list of methods for object; for example, help(PhotosDB)
- quit(): exit this interactive shell

>>> photos = get_selected()
>>> photos[0].uuid
'52083079-73D5-4921-AC1B-FE76F279133F'
>>> show(photos[0])
>>> # ^^ opens photo in Preview
>>> photos[0].location
(45.45076667, 7.01066388)
>>> quit()