[python][test] Add test/example for keyword arguments

dune/fufem/test/dunepythontest.cc

@@ -378,6 +378,15 @@ int main(int argc, char** argv)
         // You can also call a lambda function
         auto lambda = Python::Callable(Python::evaluate("lambda x,y: (x+y)"));
         std::cout << "Result of call to lambda function: " << lambda(foo, bar).str() << std::endl;
+
+        // Named arguments can also be passed and mixed with positional ones
+        using namespace Python::Literals;
+        using Python::arg;
+        auto checkIncreasing = Python::Callable(module.get("checkIncreasing"));
+        std::cout << "Result of checkIncreasing(0,1): " << checkIncreasing(0,1).str() << std::endl;
+        std::cout << "Result of checkIncreasing(0,1,reverse=False): " << checkIncreasing(0, 1, arg("reverse", false)).str() << std::endl;
+        std::cout << "Result of checkIncreasing(0,1,reverse=True): " << checkIncreasing(0, 1, "reverse"_a=true).str() << std::endl;
+        std::cout << "Result of checkIncreasing(1,reverse=True,0): " << checkIncreasing(1, "reverse"_a=true,0).str() << std::endl;
     }
 
 

dune/fufem/test/dunepythontest.py

@@ -12,6 +12,11 @@ str_list=["string1","string2","string3"]
 int_tuple=(1,2,3)
 mixed_tuple=((1,2),"three")
 
+def checkIncreasing(a, b, reverse=False):
+    if (not reverse):
+        return a<=b
+    elif reverse:
+        return b<=a
 
 
 # some utilities for creating parametrized boundaries