Display the total number of page with reportlab (source http://code.activestate.com/recipes/546511-page-x-of-y-with-reportlab/)

gistfile1.py

class NumberedCanvas(canvas.Canvas):

    def __init__(self, *args, **kwargs):
        # kwargs['verbosity'] = 1
        canvas.Canvas.__init__(self, *args, **kwargs)
        self._codes = []

    def showPage(self):
        _formsinuse = copy.deepcopy(self._formsinuse)
        self._codes.append({'code': self._code, 'stack': self._codeStack,
                            'cM' : self._cropMarks,
                            '_pageRotation':self._pageRotation,
                            '_currentPageHasImages': self._currentPageHasImages,
                            '_pageTransition': self._pageTransition,
                            '_pageCompression': self._pageCompression,
                            '_pageDuration': self._pageDuration,
                            '_psCommandsBeforePage': self._psCommandsBeforePage,
                            '_preamble': self._preamble,
                            '_psCommandsAfterPage': self._psCommandsAfterPage,
                            '_onPage': self._onPage,
                            '_formsinuse': _formsinuse
                            })
        self._startPage()

    def save(self):
        """add page info to each page (page x of y)"""
        # reset page counter
        self._pageNumber = 0
        for code in self._codes:
            # recall saved page
            self._code = code['code']
            self._codeStack = code['stack']
            self._cropMarks = code['cM']
            self._pageRotation = code['_pageRotation']
            self._currentPageHasImages = code['_currentPageHasImages']
            self._pageTransition = code['_pageTransition']
            self._pageCompression = code['_pageCompression']
            self._pageDuration = code['_pageDuration']
            self._psCommandsBeforePage = code['_psCommandsBeforePage']
            self._preamble = code['_preamble']
            self._psCommandsAfterPage =  code['_psCommandsAfterPage']
            self._onPage =  code['_onPage']
            self._formsinuse = code['_formsinuse']
            self.setFont("Helvetica", 7)
            self.drawRightString(200*mm, 15*mm,
                "Page %(this)i/%(total)i" % {
                   'this': self._pageNumber+1,
                   'total': len(self._codes),
                }
            )
            canvas.Canvas.showPage(self)
        self._doc.SaveToFile(self._filename, self)