problem with closing python pypdf - writing. getting a valueError: I/O operation on closed file -

can't figure function (part of class scraping internet site pdf) supposed merge pdf file generated web pages using pypdf.

this method code:

def mergepdf(self,mainname,inputlist=0):     """merging pdf pages     getting inputlist merge or defaults class instance self.pdftomerge list"""     pypdf import pdffilewriter, pdffilereader     self._mergelist = inputlist or self.pdftomerge     self.pdfoutput = pdffilewriter()      name in self._mergelist:         print "merging %s main pdf file: %s" % (name,mainname)         self._filestream = file(name,"rb")         self.pdfinput = pdffilereader(self._filestream)         p in self.pdfinput.pages:             self.pdfoutput.addpage(p)         self._filestream.close()      self._pdfstream = file(mainname,"wb")     self._pdfstream.open()     self.pdfoutput.write(self._pdfstream)     self._pdfstream.close() 

i keep getting error:

  file "c:\tmp\easy_install-iik9vj\pypdf-1.13-py2.7-win32.egg.tmp\pypdf\pdf.py", line 264, in write     self._sweepindirectreferences(externalreferencemap, self._root)   file "c:\tmp\easy_install-iik9vj\pypdf-1.13-py2.7-win32.egg.tmp\pypdf\pdf.py", line 339, in _sweepindirectreferences     self._sweepindirectreferences(externmap, realdata)   file "c:\tmp\easy_install-iik9vj\pypdf-1.13-py2.7-win32.egg.tmp\pypdf\pdf.py", line 315, in _sweepindirectreferences     value = self._sweepindirectreferences(externmap, value)   file "c:\tmp\easy_install-iik9vj\pypdf-1.13-py2.7-win32.egg.tmp\pypdf\pdf.py", line 339, in _sweepindirectreferences     self._sweepindirectreferences(externmap, realdata)   file "c:\tmp\easy_install-iik9vj\pypdf-1.13-py2.7-win32.egg.tmp\pypdf\pdf.py", line 315, in _sweepindirectreferences     value = self._sweepindirectreferences(externmap, value)   file "c:\tmp\easy_install-iik9vj\pypdf-1.13-py2.7-win32.egg.tmp\pypdf\pdf.py", line 324, in _sweepindirectreferences     value = self._sweepindirectreferences(externmap, data[i])   file "c:\tmp\easy_install-iik9vj\pypdf-1.13-py2.7-win32.egg.tmp\pypdf\pdf.py", line 339, in _sweepindirectreferences     self._sweepindirectreferences(externmap, realdata)   file "c:\tmp\easy_install-iik9vj\pypdf-1.13-py2.7-win32.egg.tmp\pypdf\pdf.py", line 315, in _sweepindirectreferences     value = self._sweepindirectreferences(externmap, value)   file "c:\tmp\easy_install-iik9vj\pypdf-1.13-py2.7-win32.egg.tmp\pypdf\pdf.py", line 345, in _sweepindirectreferences     newobj = data.pdf.getobject(data)   file "c:\tmp\easy_install-iik9vj\pypdf-1.13-py2.7-win32.egg.tmp\pypdf\pdf.py", line 645, in getobject     self.stream.seek(start, 0) valueerror: i/o operation on closed file 

but when check status of self._pdfstream get:

<open file 'c:\python27\learn\dive.pdf', mode 'wb' @ 0x013b2020> 

what doing wrong?

i'll glad help

ok, found problem. right call file(). don't try call open() @ all.

your problem input file still needs open when call self.pdfoutput.write(self._pdfstream), need remove line self._filestream.close().

edit: script trigger problem. first write succeed , second fail.

from pypdf import pdffilereader pfr, pdffilewriter pfw  input_filename = 'in.pdf' # replace real file output_filename = 'out.pdf' # doesn't exist  infile = file(input_filename, 'rb') reader = pfr(infile) writer = pfw()  writer.addpage(reader.getpage(0)) outfile = file(output_filename, 'wb') writer.write(outfile) print "first write successful!" infile.close() outfile.close()  infile = file(input_filename, 'rb') reader = pfr(infile) writer = pfw()  writer.addpage(reader.getpage(0)) outfile = file(output_filename, 'wb') infile.close() # bad!  writer.write(outfile) print "you'll ioerror before line" outfile.close()