Visualization methods called from command line installation

[irisdyoung]

Examining the object my_dfa from the first example directly (no str or dir or anything else) throws an error in the command line only installation (latest, on python 3.12.3, on mac):

ImportError: Missing visualization packages; please install coloraide and pygraphviz.

Is this for sure what you want? It also does return the str representation afterward, so it seems like the error could be downgraded to a warning that you're operating without visualization capabilities, and a pointer to the installation option with the necessary dependencies. Separate issue incoming on that note...

[eliotwrobson]

I'm a little confused as well, this seems to match the behavior when running in a jupyter notebook without the visualization dependencies installed, but not purely on the command line. Maybe the Mac command line automatically tries to render objects with these methods present?

I suppose we could raise a warning and then the functions will be a noop if these dependencies aren't present? I'm not really sure what other libraries do. @caleb531 any thoughts about this behavior?

[caleb531]

@irisdyoung @eliotwrobson I'm not sure I understand the issue here. I pip install automata into a fresh virtualenv (Python 3.12.3 on macOS Sonoma, using Mac terminal), and then run the first example from the FA Examples page, I am able to run the machine without error.

# example1.py
from automata.fa.dfa import DFA

# DFA which matches all binary strings ending in an odd number of '1's
my_dfa = DFA(
    states={'q0', 'q1', 'q2'},
    input_symbols={'0', '1'},
    transitions={
        'q0': {'0': 'q0', '1': 'q1'},
        'q1': {'0': 'q0', '1': 'q2'},
        'q2': {'0': 'q2', '1': 'q1'}
    },
    initial_state='q0',
    final_states={'q1'}
)

try:
    while True:
        if my_dfa.accepts_input(input('Please enter your input: ')):
            print('Accepted')
        else:
            print('Rejected')
except KeyboardInterrupt:
    print('')

[lwasser]

linking this to our review - friends can you please link any issues / pr's related to the review back to the review issue so we have a traceable review? many many thanks!! these issues and discussion are fantastic!