fix UnicodeEncodeError writing SVG string to .svg file, fixes #489

IPython/frontend/qt/svg.py

@@ -1,86 +1,86 b''
 """ Defines utility functions for working with SVG documents in Qt.
 """
 
 # System library imports.
 from IPython.external.qt import QtCore, QtGui, QtSvg
 
 
 def save_svg(string, parent=None):
     """ Prompts the user to save an SVG document to disk.
 
     Parameters:
     -----------
     string : basestring
         A Python string containing a SVG document.
 
     parent : QWidget, optional
         The parent to use for the file dialog.
 
     Returns:
     --------
     The name of the file to which the document was saved, or None if the save
     was cancelled.
     """
     dialog = QtGui.QFileDialog(parent, 'Save SVG Document')
     dialog.setAcceptMode(QtGui.QFileDialog.AcceptSave)
     dialog.setDefaultSuffix('svg')
     dialog.setNameFilter('SVG document (*.svg)')
     if dialog.exec_():
         filename = dialog.selectedFiles()[0]
         f = open(filename, 'w')
         try:
-            f.write(string)
+            f.write(string.encode('UTF-8'))
         finally:
             f.close()
         return filename
     return None
 
 def svg_to_clipboard(string):
     """ Copy a SVG document to the clipboard.
 
     Parameters:
     -----------
     string : basestring
         A Python string containing a SVG document.
     """
     if isinstance(string, unicode):
         string = string.encode('utf-8')
 
     mime_data = QtCore.QMimeData()
     mime_data.setData('image/svg+xml', string)
     QtGui.QApplication.clipboard().setMimeData(mime_data)
         
 def svg_to_image(string, size=None):
     """ Convert a SVG document to a QImage.
 
     Parameters:
     -----------
     string : basestring
         A Python string containing a SVG document.
 
     size : QSize, optional
         The size of the image that is produced. If not specified, the SVG
         document's default size is used.
     
     Raises:
     -------
     ValueError
         If an invalid SVG string is provided.
 
     Returns:
     --------
     A QImage of format QImage.Format_ARGB32.
     """
     if isinstance(string, unicode):
         string = string.encode('utf-8')
 
     renderer = QtSvg.QSvgRenderer(QtCore.QByteArray(string))
     if not renderer.isValid():
         raise ValueError('Invalid SVG data.')
 
     if size is None:
         size = renderer.defaultSize()
     image = QtGui.QImage(size, QtGui.QImage.Format_ARGB32)
     painter = QtGui.QPainter(image)
     renderer.render(painter)
     return image