Define is_complex for PyNumber

Author: isuruf

symengine/lib/pywrapper.cpp

@@ -63,6 +63,10 @@ bool PyNumber::is_negative() const {
 bool PyNumber::is_positive() const {
     return PyObject_RichCompareBool(pyobject_, pymodule_->get_zero(), Py_GT) == 1;
 }
+//! \return true if complex
+bool PyNumber::is_complex() const {
+    return false;
+}
 
 //! Addition
 RCP<const Number> PyNumber::add(const Number &other) const {

symengine/lib/symengine/pywrapper.h

@@ -80,6 +80,8 @@ class PyNumber : public NumberWrapper {
     virtual bool is_negative() const;
     //! \return true if positive
     virtual bool is_positive() const;
+    //! \return true if complex
+    virtual bool is_complex() const;
     //! return true if the number is an exact representation
     //  false if the number is an approximation
     virtual bool is_exact() const { return true; };