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simplify check for non-zero content in set()

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There's no point in casting to list just to compare to [], since
set/list/tuple will evaluate to false when empty. So we can do less work
in fewer characters.
This commit is contained in:
Eli Schwartz 2019-07-22 20:25:53 -04:00
parent 8b75e8c3e3
commit 3959c4fdca
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1 changed files with 1 additions and 1 deletions
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src/calibre/gui2/email.py
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@ -429,7 +429,7 @@ def send_by_mail(self, to, fmts, delete_from_library, subject='', send_ids=None,
dbfmts = self.library_view.model().db.formats(id, index_is_id=True)
formats = [f.lower() for f in (dbfmts.split(',') if dbfmts else
[])]
if list(set(formats).intersection(available_input_formats())) != [] and list(set(fmts).intersection(available_output_formats())) != []:
if set(formats).intersection(available_input_formats()) and set(fmts).intersection(available_output_formats()):
auto.append(id)
else:
bad.append(self.library_view.model().db.title(id, index_is_id=True))