cleanup: remove pointless r-prefixes on single-quoted strings This is the promised second step on single-quoted strings. These had existed because our source transformer didn't turn r'' into b'', so we had tagged some strings as r-strings to get "native" strings on both Pythons. Now that the transformer is gone, we can dispense with this nonsense. Methodology: I ran hg locate 'set:added() or modified() or clean()' | egrep '.*\.py$' | xargs egrep --color=never -n -- \[\^b\]\[\^a-z\]r\'\[\^\'\\\\\]\*\'\[\^\'\ in an emacs grep-mode buffer, and then used a keyboard macro to iterate over the results and remove the r prefix as needed. # skip-blame removing unneeded r prefixes left over from Python 3 migration. Differential Revision: https://phab.mercurial-scm.org/D7306

--- a/mercurial/config.py	Sun Nov 10 07:30:14 2019 -0800
+++ b/mercurial/config.py	Fri Nov 08 11:19:20 2019 -0800
@@ -212,7 +212,7 @@
     def read(self, path, fp=None, sections=None, remap=None):
         if not fp:
             fp = util.posixfile(path, b'rb')
-        assert getattr(fp, 'mode', r'rb') == r'rb', (
+        assert getattr(fp, 'mode', 'rb') == 'rb', (
             b'config files must be opened in binary mode, got fp=%r mode=%r'
             % (fp, fp.mode,)
         )