diff --git a/src/calibre/gui2/library/delegates.py b/src/calibre/gui2/library/delegates.py
index 4f002c2c48..d66959a87c 100644
--- a/src/calibre/gui2/library/delegates.py
+++ b/src/calibre/gui2/library/delegates.py
@@ -7,12 +7,12 @@ __docformat__ = 'restructuredtext en'
 
 from math import cos, sin, pi
 
-from PyQt4.Qt import QColor, Qt, QModelIndex, QSize, QPalette, \
-                     QPainterPath, QLinearGradient, QBrush, QApplication, \
-                     QPen, QStyle, QPainter, QStyleOptionViewItemV4, \
-                     QIcon,  QDoubleSpinBox, QVariant, QSpinBox, \
-                     QStyledItemDelegate, QComboBox, QTextDocument, \
-                     QAbstractTextDocumentLayout
+from PyQt4.Qt import (QColor, Qt, QModelIndex, QSize, QApplication,
+                     QPainterPath, QLinearGradient, QBrush,
+                     QPen, QStyle, QPainter, QStyleOptionViewItemV4,
+                     QIcon,  QDoubleSpinBox, QVariant, QSpinBox,
+                     QStyledItemDelegate, QComboBox, QTextDocument,
+                     QAbstractTextDocumentLayout)
 
 from calibre.gui2 import UNDEFINED_QDATE, error_dialog
 from calibre.gui2.widgets import EnLineEdit
diff --git a/src/calibre/gui2/library/models.py b/src/calibre/gui2/library/models.py
index 9d90c44f18..ae3a53b376 100644
--- a/src/calibre/gui2/library/models.py
+++ b/src/calibre/gui2/library/models.py
@@ -714,9 +714,9 @@ class BooksModel(QAbstractTableModel): # {{{
                 mi = self.db.get_metadata(self.id(index), index_is_id=True)
                 fmt = self.column_color_map[key]
                 try:
-                    color = composite_formatter.safe_format(fmt, mi, '', mi)
-                    if QColor.isValid(color):
-                        return QColor(color)
+                    color = QColor(composite_formatter.safe_format(fmt, mi, '', mi))
+                    if color.isValid():
+                        return color
                 except:
                     return None
             elif self.is_custom_column(key) and \
@@ -727,9 +727,9 @@ class BooksModel(QAbstractTableModel): # {{{
                 txt = unicode(index.data(Qt.DisplayRole).toString())
                 if len(colors) > 0 and txt in values:
                     try:
-                        color = colors[values.index(txt)]
-                        if QColor.isValid(color):
-                            return QColor(color)
+                        color = QColor(colors[values.index(txt)])
+                        if color.isValid():
+                            return color
                     except:
                         pass
             return None