Skip to content

add __bool__ for an FSM #8

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
KommuSoft wants to merge 1 commit into
base: master
Choose a base branch
from
Open

add __bool__ for an FSM #8

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
9 changes: 9 additions & 0 deletions interegular/fsm.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -761,6 +761,15 @@ def get_num_strings(state):

return get_num_strings(self.initial)

def __bool__(self):
"""
Check if the FSM accepts at least one string (i.e. is not empty). This
is better than checking len(.), which is computationally more expensive,
and will raise an OverflowError in case there are an infinite amount of
strings, whereas bool(.) will just return True.
"""
return not self.empty()

def __len__(self):
"""
Consider the FSM as a set of strings and return the cardinality of that
Expand Down