--- a/mercurial/similar.py	Sat Oct 05 10:29:34 2019 -0400
+++ b/mercurial/similar.py	Sun Oct 06 09:45:02 2019 -0400
@@ -8,9 +8,8 @@
 from __future__ import absolute_import
 
 from .i18n import _
-from . import (
-    mdiff,
-)
+from . import mdiff
+
 
 def _findexactmatches(repo, added, removed):
     '''find renamed files that have no changes
@@ -21,9 +20,11 @@
     # Build table of removed files: {hash(fctx.data()): [fctx, ...]}.
     # We use hash() to discard fctx.data() from memory.
     hashes = {}
-    progress = repo.ui.makeprogress(_('searching for exact renames'),
-                                    total=(len(added) + len(removed)),
-                                    unit=_('files'))
+    progress = repo.ui.makeprogress(
+        _('searching for exact renames'),
+        total=(len(added) + len(removed)),
+        unit=_('files'),
+    )
     for fctx in removed:
         progress.increment()
         h = hash(fctx.data())
@@ -46,11 +47,13 @@
     # Done
     progress.complete()
 
+
 def _ctxdata(fctx):
     # lazily load text
     orig = fctx.data()
     return orig, mdiff.splitnewlines(orig)
 
+
 def _score(fctx, otherdata):
     orig, lines = otherdata
     text = fctx.data()
@@ -65,9 +68,11 @@
     lengths = len(text) + len(orig)
     return equal * 2.0 / lengths
 
+
 def score(fctx1, fctx2):
     return _score(fctx1, _ctxdata(fctx2))
 
+
 def _findsimilarmatches(repo, added, removed, threshold):
     '''find potentially renamed files based on similar file content
 
@@ -75,8 +80,9 @@
     (before, after, score) tuples of partial matches.
     '''
     copies = {}
-    progress = repo.ui.makeprogress(_('searching for similar files'),
-                         unit=_('files'), total=len(removed))
+    progress = repo.ui.makeprogress(
+        _('searching for similar files'), unit=_('files'), total=len(removed)
+    )
     for r in removed:
         progress.increment()
         data = None
@@ -93,9 +99,11 @@
         source, bscore = v
         yield source, dest, bscore
 
+
 def _dropempty(fctxs):
     return [x for x in fctxs if x.size() > 0]
 
+
 def findrenames(repo, added, removed, threshold):
     '''find renamed files -- yields (before, after, score) tuples'''
     wctx = repo[None]
@@ -116,6 +124,7 @@
     # If the user requested similar files to be matched, search for them also.
     if threshold < 1.0:
         addedfiles = [x for x in addedfiles if x not in matchedfiles]
-        for (a, b, score) in _findsimilarmatches(repo, addedfiles,
-                                                 removedfiles, threshold):
+        for (a, b, score) in _findsimilarmatches(
+            repo, addedfiles, removedfiles, threshold
+        ):
             yield (a.path(), b.path(), score)