show how to implement product in Python

* wrap/python/tests/product.ipynb: New file.
* wrap/python/tests/Makefile.am, doc/org/tut.org: Add it.
* wrap/python/tests/ipnbdoctest.py: Ignore %timeit results.
* wrap/python/spot_impl.i: Add bindings for
set_state_names()/get_state_names().
* spot/twaalgos/product.cc: Fix computation of properties.
* doc/org/hoa.org: Name.
* NEWS: Update.

wrap/python/spot_impl.i

@@ -339,6 +339,7 @@ namespace std {
   %template(liststr) list<std::string>;
   %template(vectorformula) vector<spot::formula>;
   %template(vectorunsigned) vector<unsigned>;
+  %template(vectorstring) vector<string>;
   %template(atomic_prop_set) set<spot::formula>;
   %template(relabeling_map) map<spot::formula, spot::formula>;
 }
@@ -465,6 +466,18 @@ namespace std {
   std::string __str__() { return spot::str_psl(*self); }
 }
 
+%extend spot::bdd_dict {
+  bool operator==(const spot::bdd_dict& b) const
+  {
+    return self == &b;
+  }
+
+  bool operator!=(const spot::bdd_dict& b) const
+  {
+    return self != &b;
+  }
+}
+
 %extend spot::twa {
   void set_name(std::string name)
   {
@@ -475,6 +488,17 @@ namespace std {
   {
     return self->get_named_prop<std::string>("automaton-name");
   }
+
+  void set_state_names(std::vector<std::string> names)
+  {
+    self->set_named_prop("state-names",
+			 new std::vector<std::string>(std::move(names)));
+  }
+
+  std::vector<std::string>* get_state_names()
+  {
+    return self->get_named_prop<std::vector<std::string>>("state-names");
+  }
 }
 
 

wrap/python/tests/Makefile.am

@@ -49,6 +49,7 @@ TESTS = \
   optionmap.py \
   parsetgba.py \
   piperead.ipynb \
+  product.ipynb \
   randaut.ipynb \
   randgen.py \
   randltl.ipynb \

wrap/python/tests/ipnbdoctest.py

@@ -70,6 +70,9 @@ def sanitize(s):
     # normalize graphviz version
     s = re.sub(r'Generated by graphviz version.*', 'VERSION', s)
 
+    # ignore %timeit results
+    s = re.sub(r'^[0-9]+ loops, best of 3:.*per loop', '', s)
+
     # SVG generated by graphviz may put note at different positions
     # depending on the graphviz build.  Let's just strip anything that
     # look like a position.