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py3: fix dict.keys() usage

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micro-optimize: if r.keys() is empty, r is empty first.
This commit is contained in:
Eli Schwartz 2019-05-26 21:29:41 -04:00
parent d0844e8bbe
commit f915f11a0c
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1 changed files with 3 additions and 3 deletions
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6
src/calibre/ebooks/chm/metadata.py
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@ -14,6 +14,7 @@ from calibre.ebooks.metadata import string_to_authors, MetaInformation
from calibre.utils.logging import default_log from calibre.utils.logging import default_log
from calibre.ptempfile import TemporaryFile from calibre.ptempfile import TemporaryFile
from calibre import force_unicode from calibre import force_unicode
from polyglot.builtins import iterkeys
def _clean(s): def _clean(s):
@ -110,9 +111,8 @@ def _get_cover(soup, rdr):
except: except:
# Probably invalid width, height aattributes, ignore # Probably invalid width, height aattributes, ignore
continue continue
l = r.keys() if r:
l.sort() l = sorted(iterkeys(r))
if l:
ans = r[l[0]] ans = r[l[0]]
# this link comes from the internal html, which is in a subdir # this link comes from the internal html, which is in a subdir
if ans is not None: if ans is not None: