Xqt has submitted this change. ( 
https://gerrit.wikimedia.org/r/c/pywikibot/core/+/1340519?usp=email )

Change subject: Use partition for title delimiter parsing
......................................................................

Use partition for title delimiter parsing

Replace pipe checks and index-based slicing with partition when
reading page titles and language links. Use partition for namespace
prefixes where an existing guard establishes that a colon is present.

Preserve title handling and existing namespace validation.

Change-Id: Ib32d4204c40e9eacdf0b7b19f8bddecf7e304c98
---
M pywikibot/page/_links.py
M pywikibot/pagegenerators/_generators.py
M pywikibot/textlib.py
3 files changed, 5 insertions(+), 7 deletions(-)

Approvals:
  Xqt: Verified; Looks good to me, approved




diff --git a/pywikibot/page/_links.py b/pywikibot/page/_links.py
index 5804693..1999933 100644
--- a/pywikibot/page/_links.py
+++ b/pywikibot/page/_links.py
@@ -344,7 +344,7 @@
                 # remove any subsequent whitespace
                 t = t.lstrip(':').lstrip(' ')
                 continue
-            prefix = t[:t.index(':')].lower()  # part of text before :
+            prefix = t.partition(':')[0].lower()  # part of text before :
             ns = self._source.namespaces.lookup_name(prefix)
             if ns:
                 # The prefix is a namespace in the source wiki
@@ -437,7 +437,7 @@
                                                  if self._namespace % 2 else
                                                  self._namespace + 1]
                 if '' in other_ns:  # other namespace uses empty str as ns
-                    next_ns = t[:t.index(':')]
+                    next_ns = t.partition(':')[0]
                     if self._site.namespaces.lookup_name(next_ns):
                         raise InvalidTitleError(
                             f"The (non-)talk page of '{self._text}' is a valid"
diff --git a/pywikibot/pagegenerators/_generators.py 
b/pywikibot/pagegenerators/_generators.py
index 3456f6a..4dcf807 100644
--- a/pywikibot/pagegenerators/_generators.py
+++ b/pywikibot/pagegenerators/_generators.py
@@ -452,8 +452,7 @@
     f.seek(0)
     for title in f:
         title = title.strip()
-        if '|' in title:
-            title = title[:title.index('|')]
+        title = title.partition('|')[0]
         if title:
             yield pywikibot.Page(site, title)

diff --git a/pywikibot/textlib.py b/pywikibot/textlib.py
index c4f9343..e65b96b 100644
--- a/pywikibot/textlib.py
+++ b/pywikibot/textlib.py
@@ -1437,9 +1437,8 @@
         # language, or if it's e.g. a category tag or an internal link
         lang = fam.obsolete.get(lang, lang)
         if lang in fam.langs:
-            if '|' in pagetitle:
-                # ignore text after the pipe
-                pagetitle = pagetitle[:pagetitle.index('|')]
+            # ignore text after the pipe
+            pagetitle = pagetitle.partition('|')[0]
             # we want the actual page objects rather than the titles
             site = pywikibot.Site(code=lang, fam=fam)
             # skip language links to its own site

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Gerrit-MessageType: merged
Gerrit-Project: pywikibot/core
Gerrit-Branch: master
Gerrit-Change-Id: Ib32d4204c40e9eacdf0b7b19f8bddecf7e304c98
Gerrit-Change-Number: 1340519
Gerrit-PatchSet: 2
Gerrit-Owner: Mahveotm <[email protected]>
Gerrit-Reviewer: Xqt <[email protected]>
Gerrit-Reviewer: jenkins-bot
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