>>> from storage import *

>>> f = openCheck('non_existant_file.txt')
File non_existant_file.txt could not be opened.

>>> loadPrototypeMatchIndexesFromSqlite("nonexistent")
DB Error: no such table: prototypes
[]
>>> loadTrajectoriesFromSqlite("nonexistent", 'feature')
DB Error: no such table: positions
DB Error: no such table: velocities
[]