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+#!/usr/bin/env python
+
+#####################
+## \file exceptions.py
+## \verbatim
+## Top contributors (to current version):
+## Andres Noetzli
+## This file is part of the CVC4 project.
+## Copyright (c) 2009-2020 by the authors listed in the file AUTHORS
+## in the top-level source directory) and their institutional affiliations.
+## All rights reserved. See the file COPYING in the top-level source
+## directory for licensing information.\endverbatim
+##
+## \brief Catching CVC4 exceptions with the legacy Python API.
+##
+## A simple demonstration of catching CVC4 execptions with the legacy Python
+## API.
+
+import CVC4
+import sys
+
+
+def main():
+ em = CVC4.ExprManager()
+ smt = CVC4.SmtEngine(em)
+
+ smt.setOption("produce-models", CVC4.SExpr("true"))
+
+ # Setting an invalid option
+ try:
+ smt.setOption("non-existing", CVC4.SExpr("true"))
+ return 1
+ except CVC4.Exception as e:
+ print(e.toString())
+
+ # Creating a term with an invalid type
+ try:
+ integer = em.integerType()
+ x = em.mkVar("x", integer)
+ invalidExpr = em.mkExpr(CVC4.AND, x, x)
+ smt.checkSat(invalidExpr)
+ return 1
+ except CVC4.Exception as e:
+ print(e.toString())
+
+ # Asking for a model after unsat result
+ try:
+ smt.checkSat(em.mkBoolConst(False))
+ smt.getModel()
+ return 1
+ except CVC4.Exception as e:
+ print(e.toString())
+
+ return 0
+
+
+if __name__ == '__main__':
+ sys.exit(main())
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