automaton.is_empty

Whether the automaton is empty, i.e., it has no states.

Examples



In [1]:

    
import vcsn



In [2]:

    
%%automaton a daut
context = "lal_char, b"
0

This automaton is useless (it accepts the empty language), yet it is not empty.



In [3]:

    
a.is_empty()









    Out[3]:





False

If we trim it, then it is empty (which is why it seems that there is no result):



In [4]:

    
a.trim()









    Out[4]:



In [5]:

    
a.trim().is_empty()









    Out[5]:





True