Slight improvements to Python docs

(cherry picked from commit 4b0f6b7)

Author: nyalldawson

python/core/auto_generated/qgsmimedatautils.sip.in

@@ -42,23 +42,23 @@ Returns encoded representation of the object
 
       QgsVectorLayer *vectorLayer( bool &owner, QString &error ) const;
 %Docstring
-Gets vector layer from uri if possible, otherwise returns 0 and error is set
+Gets vector layer from uri if possible, otherwise returns None and error is set
 
 :param owner: set to true if caller becomes owner
 :param error: set to error message if cannot get vector
 %End
 
       QgsRasterLayer *rasterLayer( bool &owner, QString &error ) const;
 %Docstring
-Gets raster layer from uri if possible, otherwise returns 0 and error is set
+Gets raster layer from uri if possible, otherwise returns None and error is set
 
 :param owner: set to true if caller becomes owner
 :param error: set to error message if cannot get raster
 %End
 
       QgsMeshLayer *meshLayer( bool &owner, QString &error ) const;
 %Docstring
-Gets mesh layer from uri if possible, otherwise returns 0 and error is set
+Gets mesh layer from uri if possible, otherwise returns None and error is set
 
 :param owner: set to true if caller becomes owner
 :param error: set to error message if cannot get raster

python/gui/auto_generated/qgsrubberband.sip.in

@@ -225,7 +225,7 @@ In contrast to addGeometry(), this method does also change the geometry type of
 
 :param geom: the geometry object
 :param layer: the layer containing the feature, used for coord transformation to map
-              crs. In case of 0 pointer, the coordinates are not going to be transformed.
+              crs. If ``layer`` is None, the coordinates are not going to be transformed.
 %End
 
     void setToGeometry( const QgsGeometry &geometry, const QgsCoordinateReferenceSystem &crs = QgsCoordinateReferenceSystem() );
@@ -256,7 +256,7 @@ setToGeometry() is also to be preferred for backwards-compatibility.
 
 :param geometry: the geometry object. Will be treated as a collection of vertices.
 :param layer: the layer containing the feature, used for coord transformation to map
-              crs. In case of 0 pointer, the coordinates are not going to be transformed.
+              crs. If ``layer`` is None, the coordinates are not going to be transformed.
 %End
 
     void addGeometry( const QgsGeometry &geometry, const QgsCoordinateReferenceSystem &crs = QgsCoordinateReferenceSystem() );

python/gui/auto_generated/qgsvariableeditorwidget.sip.in

@@ -68,7 +68,7 @@ be modified by users.
 %Docstring
 Returns the current editable scope for the widget.
 
-:return: editable scope, or 0 if no editable scope is set
+:return: editable scope, or None if no editable scope is set
 
 .. seealso:: :py:func:`setEditableScopeIndex`
 %End

src/core/qgsmimedatautils.h

@@ -52,21 +52,21 @@ class CORE_EXPORT QgsMimeDataUtils
       QString data() const;
 
       /**
-       * Gets vector layer from uri if possible, otherwise returns 0 and error is set
+       * Gets vector layer from uri if possible, otherwise returns nullptr and error is set
        * \param owner set to true if caller becomes owner
        * \param error set to error message if cannot get vector
        */
       QgsVectorLayer *vectorLayer( bool &owner, QString &error ) const;
 
       /**
-       * Gets raster layer from uri if possible, otherwise returns 0 and error is set
+       * Gets raster layer from uri if possible, otherwise returns nullptr and error is set
        * \param owner set to true if caller becomes owner
        * \param error set to error message if cannot get raster
        */
       QgsRasterLayer *rasterLayer( bool &owner, QString &error ) const;
 
       /**
-       * Gets mesh layer from uri if possible, otherwise returns 0 and error is set
+       * Gets mesh layer from uri if possible, otherwise returns nullptr and error is set
        * \param owner set to true if caller becomes owner
        * \param error set to error message if cannot get raster
        */

src/gui/qgsrubberband.h

@@ -256,7 +256,7 @@ class GUI_EXPORT QgsRubberBand : public QObject, public QgsMapCanvasItem
      * In contrast to addGeometry(), this method does also change the geometry type of the rubberband.
      *  \param geom the geometry object
      *  \param layer the layer containing the feature, used for coord transformation to map
-     *               crs. In case of 0 pointer, the coordinates are not going to be transformed.
+     *               crs. If \a layer is nullptr, the coordinates are not going to be transformed.
      */
     void setToGeometry( const QgsGeometry &geom, QgsVectorLayer *layer );
 
@@ -286,7 +286,7 @@ class GUI_EXPORT QgsRubberBand : public QObject, public QgsMapCanvasItem
      *
      *  \param geometry the geometry object. Will be treated as a collection of vertices.
      *  \param layer the layer containing the feature, used for coord transformation to map
-     *               crs. In case of 0 pointer, the coordinates are not going to be transformed.
+     *               crs. If \a layer is nullptr, the coordinates are not going to be transformed.
      */
     void addGeometry( const QgsGeometry &geometry, QgsVectorLayer *layer );
 

src/gui/qgsvariableeditorwidget.h

@@ -82,7 +82,7 @@ class GUI_EXPORT QgsVariableEditorWidget : public QWidget
 
     /**
      * Returns the current editable scope for the widget.
-     * \returns editable scope, or 0 if no editable scope is set
+     * \returns editable scope, or nullptr if no editable scope is set
      * \see setEditableScopeIndex()
      */
     QgsExpressionContextScope *editableScope() const;