Python-docx: TypeError: string argument expected, got 'bytes'

[chcourses]

Hi,
document.save() receives a file path or stream, right? What am I doing wrong?

This a flask application....
`@app.route('/doc')
def index():

document = Document()
document.add_heading('Document Title', 0)
document.add_paragraph('Some text')
buffer = io.StringIO()
document.save(buffer)
buffer.seek(0)
return Response(buffer, mimetype='application/vnd.openxmlformats-officedocument.wordprocessingml.document')`

ERROR:

• Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
  [2018-09-20 19:53:58,458] ERROR in app: Exception on /doc [GET]
  Traceback (most recent call last):
  File "C:\Users\chsdo\PycharmProjects\untitled\venv\lib\site-packages\flask\app.py", line 2292, in wsgi_app
  response = self.full_dispatch_request()
  File "C:\Users\chsdo\PycharmProjects\untitled\venv\lib\site-packages\flask\app.py", line 1815, in full_dispatch_request
  rv = self.handle_user_exception(e)
  File "C:\Users\chsdo\PycharmProjects\untitled\venv\lib\site-packages\flask\app.py", line 1718, in handle_user_exception
  reraise(exc_type, exc_value, tb)
  File "C:\Users\chsdo\PycharmProjects\untitled\venv\lib\site-packages\flask_compat.py", line 35, in reraise
  raise value
  File "C:\Users\chsdo\PycharmProjects\untitled\venv\lib\site-packages\flask\app.py", line 1813, in full_dispatch_request
  rv = self.dispatch_request()
  File "C:\Users\chsdo\PycharmProjects\untitled\venv\lib\site-packages\flask\app.py", line 1799, in dispatch_request
  return self.view_functionsrule.endpoint
  File "C:\Users\chsdo\PycharmProjects\untitled\app.py", line 26, in index
  document.save(buffer)
  File "C:\Users\chsdo\PycharmProjects\untitled\venv\lib\site-packages\docx\document.py", line 142, in save
  self._part.save(path_or_stream)
  File "C:\Users\chsdo\PycharmProjects\untitled\venv\lib\site-packages\docx\parts\document.py", line 130, in save
  self.package.save(path_or_stream)
  File "C:\Users\chsdo\PycharmProjects\untitled\venv\lib\site-packages\docx\opc\package.py", line 160, in save
  PackageWriter.write(pkg_file, self.rels, self.parts)
  File "C:\Users\chsdo\PycharmProjects\untitled\venv\lib\site-packages\docx\opc\pkgwriter.py", line 33, in write
  PackageWriter._write_content_types_stream(phys_writer, parts)
  File "C:\Users\chsdo\PycharmProjects\untitled\venv\lib\site-packages\docx\opc\pkgwriter.py", line 45, in _write_content_types_stream
  phys_writer.write(CONTENT_TYPES_URI, cti.blob)
  File "C:\Users\chsdo\PycharmProjects\untitled\venv\lib\site-packages\docx\opc\phys_pkg.py", line 155, in write
  self._zipf.writestr(pack_uri.membername, blob)
  File "C:\Users\chsdo\AppData\Local\Programs\Python\Python37\lib\zipfile.py", line 1762, in writestr
  with self.open(zinfo, mode='w') as dest:
  File "C:\Users\chsdo\AppData\Local\Programs\Python\Python37\lib\zipfile.py", line 1448, in open
  return self._open_to_write(zinfo, force_zip64=force_zip64)
  File "C:\Users\chsdo\AppData\Local\Programs\Python\Python37\lib\zipfile.py", line 1561, in _open_to_write
  self.fp.write(zinfo.FileHeader(zip64))
  TypeError: string argument expected, got 'bytes'
  Exception ignored in:
  Traceback (most recent call last):
  File "C:\Users\chsdo\AppData\Local\Programs\Python\Python37\lib\zipfile.py", line 1767, in __del__
  self.close()
  File "C:\Users\chsdo\AppData\Local\Programs\Python\Python37\lib\zipfile.py", line 1785, in close
  self._write_end_record()
  File "C:\Users\chsdo\AppData\Local\Programs\Python\Python37\lib\zipfile.py", line 1888, in _write_end_record
  self.fp.write(endrec)
  TypeError: string argument expected, got 'bytes'
  127.0.0.1 - - [20/Sep/2018 19:53:58] "GET /doc HTTP/1.1" 500 -

[scanny]

Pretty sure you want io.BytesIO rather that io.StringIO because the saved file is binary, not unicode. Also, I'm not sure what Flask is looking for as the first parameter of the Response() call, but I expect it's bytes rather than a file-like object. You can get bytes from an io.BytesIO object with buffer.getvalue(), and there's no need to .seek(0) before that call.

[chcourses]

@scanny thanks a lot!
I appreciate your help and many thanks for the incredible tool that you are building...
You gave me the solution. My code now works fine...

`
def index():

document = Document()
document.add_paragraph('A plain paragraph having some ')
document.add_heading('Heading, level 1')
document.add_paragraph('Intense quote')
buffer = io.BytesIO()
document.save(buffer)
buffer.seek(0)

return send_file(buffer, as_attachment=True, attachment_filename='report.doc')`

[enjlife]

Pretty sure you want io.BytesIO rather that io.StringIO because the saved file is binary, not unicode. Also, I'm not sure what Flask is looking for as the first parameter of the Response() call, but I expect it's bytes rather than a file-like object. You can get bytes from an io.BytesIO object with buffer.getvalue(), and there's no need to .seek(0) before that call.

Thank you so much! help me a lot