Access attributes of Python objects.

docs/index.rst

@@ -150,6 +150,12 @@ imported modules using:
     If a JavaScript exception occurs in the callback, the :func:`error`
     signal is emitted with ``traceback`` containing the exception info.
 
+Attributes on Python objects can be accessed using :func:`getattr`:
+
+.. function:: getattr(obj, string attr) -> var
+
+    Get the attribute ``attr`` of the Python object ``obj``.
+
 For some of these methods, there also exist synchronous variants, but it is
 highly recommended to use the asynchronous variants instead to avoid blocking
 the QML UI thread:

src/qpython.cpp

@@ -300,6 +300,34 @@ QPython::callMethod_sync(QVariant obj, QString method, QVariant args)
     return v;
 }
 
+QVariant
+QPython::getattr(QVariant obj, QString attr) {
+    priv->enter();
+    PyObject *pyobj = convertQVariantToPyObject(obj);
+
+    if (pyobj == NULL) {
+        emit error(QString("Failed to convert %1 to python object: '%1' (%2)").arg(obj.toString()).arg(priv->formatExc()));
+        priv->leave();
+        return QVariant();
+    }
+
+    QByteArray byteArray = attr.toUtf8();
+    const char *attrStr = byteArray.data();
+
+    PyObject *o = PyObject_GetAttrString(pyobj, attrStr);
+
+    if (o == NULL) {
+        emit error(QString("Attribute not found: '%1' (%2)").arg(attr).arg(priv->formatExc()));
+        priv->leave();
+        return QVariant();
+    }
+
+    QVariant v = convertPyObjectToQVariant(o);
+    Py_DECREF(o);
+    priv->leave();
+    return v;
+}
+
 void
 QPython::finished(QVariant result, QJSValue *callback)
 {

src/qpython.h

@@ -308,6 +308,27 @@ class QPython : public QObject {
             QString func,
             QVariant args=QVariantList());
 
+        /**
+         * \brief Get an attribute value of a Python object synchronously
+         *
+         * \code
+         * Python {
+         *     Component.onCompleted: {
+         *         importModule('datetime', function() {
+         *             call('datetime.datetime.now', [], function(dt) {
+         *                 console.log('Year: ' + getattr(dt, 'year'));
+         *             });
+         *         });
+         *     }
+         * }
+         * \endcode
+         *
+         * \arg obj The Python object
+         * \arg attr The attribute to get
+         * \result The attribute value
+         **/
+        Q_INVOKABLE QVariant
+        getattr(QVariant obj, QString attr);
 
         /**
          * \brief Get the PyOtherSide version