Running Calibre 4.9.1 here. Thanks for the beta - I was getting an xrange error switching libraries and the beta seems to have fixed that.
I mostly use the plugin to weed out publisher variations. If I do Find Metadata variations->check "Publisher", and then press "Search", I get this error:
Code:
calibre, version 4.9.1
ERROR: Unhandled exception: <b>TypeError</b>:'cmp' is an invalid keyword argument for this function
calibre 4.9.1 embedded-python: False is64bit: True
Linux-4.19.97-gentoo-x86_64-Intel-R-_Core-TM-_i7-4790K_CPU_@_4.00GHz-with-gentoo-2.6 Linux ('64bit', 'ELF')
('Linux', '4.19.97-gentoo', '#2 SMP PREEMPT Sat Feb 1 18:45:22 CST 2020')
Python 3.6.9
Linux: ('Gentoo Base System', '2.6', '')
Interface language: None
Successfully initialized third party plugins: Count Pages (1, 9, 0) && Diaps Editing Toolbag (0, 3, 6) && EpubSplit (2, 9, 0) && Extract ISBN (1, 4, 4) && Find Duplicates (1, 6, 5) && Goodreads Sync (1, 14, 2) && KindleUnpack - The Plugin (0, 82, 1) && Kobo Books (1, 8, 0) && Modify ePub (1, 4, 0) && Quality Check (1, 9, 11)
Traceback (most recent call last):
File "calibre_plugins.find_duplicates.dialogs", line 705, in _refresh_results
File "calibre_plugins.find_duplicates.variation_algorithms", line 49, in run_variation_check
File "calibre_plugins.find_duplicates.variation_algorithms", line 117, in _flatten_candidates_for_item
File "calibre_plugins.find_duplicates.variation_algorithms", line 136, in _clean_dup_groups
TypeError: 'cmp' is an invalid keyword argument for this function