Python 3.10 save_data to StringIO error TypeError: string argument expected, got 'bytes'

[ondrejkolin]

Writing to memory example from the README.md doesn't work in Python3.10.

>>> from pyexcel_ods3 import save_data
>>> data = OrderedDict()
>>> data.update({"Sheet 1": [[1, 2, 3], [4, 5, 6]]})
>>> data.update({"Sheet 2": [[7, 8, 9], [10, 11, 12]]})
>>> io = StringIO()
>>> save_data(io, data)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/ondrej/logistic/backend/venv/lib64/python3.10/site-packages/pyexcel_ods3/__init__.py", line 43, in save_data
    write_data(afile, data, file_type=file_type, **keywords)
  File "/home/ondrej/logistic/backend/venv/lib64/python3.10/site-packages/pyexcel_io/io.py", line 142, in save_data
    with get_writer(**keywords) as writer:
  File "/home/ondrej/logistic/backend/venv/lib64/python3.10/site-packages/pyexcel_io/writer.py", line 51, in __exit__
    self.close()
  File "/home/ondrej/logistic/backend/venv/lib64/python3.10/site-packages/pyexcel_io/writer.py", line 45, in close
    self.writer.close()
  File "/home/ondrej/logistic/backend/venv/lib64/python3.10/site-packages/pyexcel_ods3/odsw.py", line 114, in close
    self.ods_book.save()
  File "/home/ondrej/logistic/backend/venv/lib64/python3.10/site-packages/ezodf/document.py", line 125, in save
    self._saving_routine()
  File "/home/ondrej/logistic/backend/venv/lib64/python3.10/site-packages/ezodf/document.py", line 233, in _saving_routine
    self.filemanager.save(self.docname, backup=self.backup)
  File "/home/ondrej/logistic/backend/venv/lib64/python3.10/site-packages/ezodf/filemanager.py", line 88, in save
    self._tozip(zippo)
  File "/home/ondrej/logistic/backend/venv/lib64/python3.10/site-packages/ezodf/filemanager.py", line 144, in _tozip
    zippo.writestr(mimetype.zipinfo, mimetype.tobytes())
  File "/usr/lib64/python3.10/zipfile.py", line 1814, in writestr
    with self.open(zinfo, mode='w') as dest:
  File "/usr/lib64/python3.10/zipfile.py", line 1517, in open
    return self._open_to_write(zinfo, force_zip64=force_zip64)
  File "/usr/lib64/python3.10/zipfile.py", line 1612, in _open_to_write
    self.fp.write(zinfo.FileHeader(zip64))
TypeError: string argument expected, got 'bytes'

[Lapeth]

Agreed. This is quite annoying.

[chfw]

sorry, this has been an error in read me. please use BytesIO instead. I have updated the readme file now.