como fazer com que o csvkit converta arquivos xlsx muito largos - mensagens de erro estranhas

Question

Tenho tentado converter vários arquivos xlsx muito largos (mais de 200 colunas) em arquivos csv para poder agregá-los em um único arquivo para análise. Tenho tentado usar o csvkit, mas ele simplesmente trava nos arquivos.

A mensagem de erro quando eu ligo o modo detalhado varia cada vez que eu executo, aqui está uma:

C:\_analysis>in2csv -v 85910332_PE20160101_RECLMEXP.xlsx > test.csv
c:\python35\lib\site-packages\openpyxl\workbook\names\named_range.py:121: UserWarning: Discarded range with reserved name
  warnings.warn("Discarded range with reserved name")
Traceback (most recent call last):
  File "C:\Python35\Scripts\in2csv-script.py", line 9, in <module>
    load_entry_point('csvkit==0.9.1', 'console_scripts', 'in2csv')()
  File "c:\python35\lib\site-packages\csvkit\utilities\in2csv.py", line 82, in launch_new_instance
    utility.main()
  File "c:\python35\lib\site-packages\csvkit\utilities\in2csv.py", line 76, in main
    data = convert.convert(self.input_file, filetype, **kwargs)
  File "c:\python35\lib\site-packages\csvkit\convert\__init__.py", line 39, in convert
    return xlsx2csv(f, **kwargs)
  File "c:\python35\lib\site-packages\csvkit\convert\xlsx.py", line 66, in xlsx2csv
    value = c.value
  File "c:\python35\lib\site-packages\openpyxl\cell\read_only.py", line 107, in value
    if self.data_type == 'b':
KeyboardInterrupt

Quando executei novamente, o erro foi um pouco diferente:

C:\_analysis>in2csv -v 85910332_PE20160101_RECLMEXP.xlsx > test.csv
c:\python35\lib\site-packages\openpyxl\workbook\names\named_range.py:121: UserWarning: Discarded range with reserved name
  warnings.warn("Discarded range with reserved name")
Traceback (most recent call last):
  File "C:\Python35\Scripts\in2csv-script.py", line 9, in <module>
    load_entry_point('csvkit==0.9.1', 'console_scripts', 'in2csv')()
  File "c:\python35\lib\site-packages\csvkit\utilities\in2csv.py", line 82, in launch_new_instance
    utility.main()
  File "c:\python35\lib\site-packages\csvkit\utilities\in2csv.py", line 76, in main
    data = convert.convert(self.input_file, filetype, **kwargs)
  File "c:\python35\lib\site-packages\csvkit\convert\__init__.py", line 39, in convert
    return xlsx2csv(f, **kwargs)
  File "c:\python35\lib\site-packages\csvkit\convert\xlsx.py", line 58, in xlsx2csv
    for i, row in enumerate(sheet.iter_rows()):
  File "c:\python35\lib\site-packages\openpyxl\worksheet\iter_worksheet.py", line 103, in get_squared_range
    for _event, element in p:
  File "c:\python35\lib\xml\etree\ElementTree.py", line 1290, in __next__
    for event in self._parser.read_events():
  File "c:\python35\lib\xml\etree\ElementTree.py", line 1257, in read_events
    index = self._index
KeyboardInterrupt

Alguma ideia?

Estou executando o Windows 10, os arquivos de origem estão no Excel 2013 e Python 3.5.1 e as seguintes versões da biblioteca csvkit==0.9.1 jdcal==1.2 numpy==1.10.2 openpyxl==2.2.0b1 python-dateutil ==2,2 seis==1.10.0 SQLAlchemy==1.0.13 xlrd==1.0.0