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Compatibility
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Support for Python 2.5 dropped.
Major changes
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* Support conditional formatting
* Support lxml as backend
* Support reading and writing comments
* pytest as testrunner now required
* Improvements in charts: new types, more reliable
Minor changes
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* load_workbook now accepts data_only to allow extracting values only from
formulae. Default is false.
* Images can now be anchored to cells
* Docs updated
* Provisional benchmarking
* Added convenience methods for accessing worksheets and cells by key