I recently started using matplotlib together with PyQt, and I love it. It’s awesome and has many more features compared to PyQWT. However, I needed to save the plots to a PDF file. Here is how you do that:
filename,_ = QtGui.QFileDialog.getSaveFileName(self, "Save plots as PDF file", "", "Portable Document File (*.pdf)")
if filename == "":
pp = matplotlib.backends.backend_pdf.PdfPages(filename)
Assuming that your figure is called self.plotFigure. You can connect the above slot to a QAction and map it to some nice menu item or shortcut.