diff --git a/core/SympyCdb.cc b/core/SympyCdb.cc
index a02b204f90..7b34495208 100644
--- a/core/SympyCdb.cc
+++ b/core/SympyCdb.cc
@@ -32,10 +32,13 @@ pybind11::object sympy::SympyBridge::export_ex()
 	pybind11::module sympy_parser = pybind11::module::import("sympy.parsing.sympy_parser");
 	auto parse = sympy_parser.attr("parse_expr");
 #ifdef DEBUG
-	std::cerr << str.str() << std::endl;
+	std::cerr << "sympy::SympyBridge::export_ex: " << str.str() << std::endl;
 #endif
 	pybind11::object ret = parse(str.str());
-
+#ifdef DEBUG
+	std::cerr << "sympy::SympyBridge::export_ex: succes" << std::endl;
+#endif
+	
 	return ret;
 	}
 
@@ -43,7 +46,7 @@ void sympy::SympyBridge::import_ex(const std::string& s)
 	{
 	preparse_import(s);
 #ifdef DEBUG
-	std::cerr << s << std::endl;
+	std::cerr << "sympy::SympyBridge::import_ex: " << s << std::endl;
 #endif
 	auto ptr = std::make_shared<Ex>();
 	cadabra::Parser parser(ptr);
diff --git a/core/pythoncdb/py_ex.hh b/core/pythoncdb/py_ex.hh
index 53111e15b7..15a8ba4759 100644
--- a/core/pythoncdb/py_ex.hh
+++ b/core/pythoncdb/py_ex.hh
@@ -18,7 +18,7 @@ namespace cadabra {
 
 	/// \ingroup pythoncore
 	///
-	/// Add two expressions, adding a top-level \sum node if required.
+	/// Add two expressions, adding a top-level '\sum' node if required.
 
 	Ex_ptr Ex_add(const Ex_ptr ex1, const ExNode ex2);
 	Ex_ptr Ex_add(const Ex_ptr ex1, const Ex_ptr ex2);
@@ -26,13 +26,13 @@ namespace cadabra {
 
 	/// \ingroup pythoncore
 	///
-	/// Multiply two expressions, adding a top-level \prod node if required.
+	/// Multiply two expressions, adding a top-level '\prod' node if required.
 	Ex_ptr Ex_mul(const Ex_ptr ex1, const Ex_ptr ex2);
 	Ex_ptr Ex_mul(const Ex_ptr ex1, const Ex_ptr ex2, Ex::iterator top2);
 
 	/// \ingroup pythoncore
 	///
-	/// Subtract two expressions, adding a top-level \sum node if required.
+	/// Subtract two expressions, adding a top-level '\sum' node if required.
 	Ex_ptr Ex_sub(const Ex_ptr ex1, const ExNode ex2);
 	Ex_ptr Ex_sub(const Ex_ptr ex1, const Ex_ptr ex2);
 	Ex_ptr Ex_sub(const Ex_ptr ex1, const Ex_ptr ex2, Ex::iterator top2);
@@ -109,4 +109,4 @@ namespace cadabra {
 	void call_post_process(Kernel& kernel, Ex_ptr ex);
 
 	void init_ex(pybind11::module& m);
-	}
\ No newline at end of file
+	}
diff --git a/tests/sympy_cdb.cdb b/tests/sympy_cdb.cdb
index 2c2c851af3..0effbe1465 100644
--- a/tests/sympy_cdb.cdb
+++ b/tests/sympy_cdb.cdb
@@ -4,7 +4,7 @@ def test01():
    __cdbkernel__=create_scope()    
    ex:=3x + x**2 + a x**2 + b x;
    q=SympyBridge(ex)
-   q.from_sympy( str(sympy.collect(q.to_sympy(), $x$)) )
+   q.from_sympy( str(sympy.collect(q.to_sympy(), str($x$))) )
    tst:= x**2 (a + 1) + x ( b + 3) - @(ex);
    assert(tst==0)
    print("Test 01 passed")
@@ -13,10 +13,10 @@ test01()
 
 def test02():
    __cdbkernel__=create_scope()
-   {r,t}::Coordinate;
-   f::Depends(r,t);
+   {r,t}::Coordinate.
+   f::Depends(r,t).
    ex:=f*A;
-   \partial{#}::PartialDerivative;
+   \partial{#}::PartialDerivative.
    ex:= \partial_{r}{ f + (\sin(r)**2)**2 };
    map_sympy(ex)
    tst:= \partial_{r}{f} + 4 \sin(r)**3 \cos(r) - @(ex);
@@ -27,9 +27,9 @@ test02()
 
 def test03():
    __cdbkernel__=create_scope() 
-   \tau::Coordinate;
-   \partial{#}::Derivative(\tau);
-   r::Depends(\tau);
+   \tau::Coordinate.
+   \partial{#}::Derivative(\tau).
+   r::Depends(\tau).
    ex:=\partial{r};
    q=SympyBridge(ex)
    q.from_sympy(str(q.to_sympy()))