exception handling Flashcards
1
Q
How do we classify errors based on their origin
A
New and bubbled-up
2
Q
What are further distinction can you have for new and bubbled-up errors
A
Recoverable and non-recoverable
3
Q
What are the 4 scenarios
A
- New recoverable
- Bubbled-up recoverable
- New non-recoverable
- Bubbled-up non-recoverable
4
Q
Example of New Recoverable error
A
LBYL
def add_song_to_db(song)
if song.year is None
song.year = 'Unknown'
5
Q
Example of Bubbled-up recoverable error
A
def add_song_to_db(song):
try:
artist = get_artist_from_db(song.artist)
except NotFound:
add_artist_to_db(song.artist)
6
Q
Example of new non-recoverable
A
def add_song_to_db(song):
if song.name is None:
raise ValueError('Song must have a name')
7
Q
Example of bubbled-up non-recoverable error
A
def get_new_song():
song = get_song_from_user()
add_song_to_db(song)
8
Q
Why is it ok to let errors bubble-up?
A
Separation of concerns. Let higher layers with more context decide how to handle errors. You may not even want to print as it’s not the layers job to concern itself with how output should be handled.
