Saving this workbook fails
*Created originally on Bitbucket by [Emery Berger (emery@cs.umass.edu)](https://bitbucket.org/%7B0cc360f0-2dec-4ea4-b52a-aa27b7dde229%7D/)* Opening this sheet as not read-only and saving it fails reliably. Worked with a previous version. ``` #!python import openpyxl fname = "sheets/subjects_xlsx/01sumdat.xlsx" outname = "testme.xlsx" workbook = openpyxl.load_workbook(filename=fname, read_only=False) workbook.save(outname) ``` ``` #!python $ python repro.py Traceback (most recent call last): File "repro.py", line 7, in <module> workbook.save(outname) File "/Users/emery/anaconda3/lib/python3.7/site-packages/openpyxl/workbook/workbook.py", line 396, in save save_workbook(self, filename) File "/Users/emery/anaconda3/lib/python3.7/site-packages/openpyxl/writer/excel.py", line 294, in save_workbook writer.save() File "/Users/emery/anaconda3/lib/python3.7/site-packages/openpyxl/writer/excel.py", line 276, in save self.write_data() File "/Users/emery/anaconda3/lib/python3.7/site-packages/openpyxl/writer/excel.py", line 76, in write_data self._write_worksheets() File "/Users/emery/anaconda3/lib/python3.7/site-packages/openpyxl/writer/excel.py", line 216, in _write_worksheets self.write_worksheet(ws) File "/Users/emery/anaconda3/lib/python3.7/site-packages/openpyxl/writer/excel.py", line 201, in write_worksheet writer.write() File "/Users/emery/anaconda3/lib/python3.7/site-packages/openpyxl/worksheet/_writer.py", line 357, in write self.write_tail() File "/Users/emery/anaconda3/lib/python3.7/site-packages/openpyxl/worksheet/_writer.py", line 345, in write_tail self.write_breaks() File "/Users/emery/anaconda3/lib/python3.7/site-packages/openpyxl/worksheet/_writer.py", line 241, in write_breaks self.xf.send(brk.to_tree()) AttributeError: 'tuple' object has no attribute 'to_tree' ``` My code (not this piece) is now failing on 16 other spreadsheets it previously worked on, and I suspect the problem is the same. *Attachments:* [01sumdat.xlsx](/uploads/a57c8370d634d2b90ae7a26bbb279f4d/01sumdat.xlsx)
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