Xqt has submitted this change. ( 
https://gerrit.wikimedia.org/r/c/pywikibot/core/+/1328312?usp=email )

Change subject: wikibase: Reuse collection key views
......................................................................

wikibase: Reuse collection key views

Resolve the current and comparison key views once while serializing language
and alias differences. Reuse them across intersection and difference checks.

Change-Id: Ia4dbfb40141a433c0cc85d9c158b41cedfea15b0
---
M pywikibot/page/_collections.py
1 file changed, 10 insertions(+), 6 deletions(-)

Approvals:
  Xqt: Verified; Looks good to me, approved
  jenkins-bot: Verified




diff --git a/pywikibot/page/_collections.py b/pywikibot/page/_collections.py
index 263cf3a..6735e23 100644
--- a/pywikibot/page/_collections.py
+++ b/pywikibot/page/_collections.py
@@ -120,11 +120,13 @@
         """
         data = {}
         diffto = diffto or {}
-        for key in diffto.keys() - self.keys():
+        current_keys = self.keys()
+        diffto_keys = diffto.keys()
+        for key in diffto_keys - current_keys:
             data[key] = {'language': key, 'value': ''}
-        for key in self.keys() - diffto.keys():
+        for key in current_keys - diffto_keys:
             data[key] = {'language': key, 'value': self[key]}
-        for key in self.keys() & diffto.keys():
+        for key in current_keys & diffto_keys:
             if self[key] != diffto[key]['value']:
                 data[key] = {'language': key, 'value': self[key]}
         return data
@@ -183,16 +185,18 @@
         """
         data = {}
         diffto = diffto or {}
-        for lang in diffto.keys() & self.keys():
+        current_keys = self.keys()
+        diffto_keys = diffto.keys()
+        for lang in diffto_keys & current_keys:
             if (sorted(val['value'] for val in diffto[lang])
                     != sorted(self[lang])):
                 data[lang] = [{'language': lang, 'value': i}
                               for i in self[lang]]
-        for lang in diffto.keys() - self.keys():
+        for lang in diffto_keys - current_keys:
             data[lang] = [
                 {'language': lang, 'value': i['value'], 'remove': ''}
                 for i in diffto[lang]]
-        for lang in self.keys() - diffto.keys():
+        for lang in current_keys - diffto_keys:
             data[lang] = [{'language': lang, 'value': i} for i in self[lang]]
         return data


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Gerrit-MessageType: merged
Gerrit-Project: pywikibot/core
Gerrit-Branch: master
Gerrit-Change-Id: Ia4dbfb40141a433c0cc85d9c158b41cedfea15b0
Gerrit-Change-Number: 1328312
Gerrit-PatchSet: 2
Gerrit-Owner: Mahveotm <[email protected]>
Gerrit-Reviewer: Xqt <[email protected]>
Gerrit-Reviewer: jenkins-bot
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