diff options
| -rw-r--r-- | prolog/engine.py | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/prolog/engine.py b/prolog/engine.py index ea9b19a..8ad8bfa 100644 --- a/prolog/engine.py +++ b/prolog/engine.py @@ -284,13 +284,13 @@ class PrologEngine(object): name = Term() arity = Term() self.call('functor/3', [term, name, arity]) - return '{}/{}'.format(name, arity) + return "'{}'/{}".format(name, arity) fid = PL_open_foreign_frame() clause = Term(clause) functor = main_functor(clause) # Check whether [clause] is a rule or a fact. - if functor == ':-/2': + if functor == "':-'/2": # [clause] is a rule, return the main functor for the head. head = Term() self.call('arg/3', [Term(1), clause, head]) |