[PATCH 1 of 9] py3: replace "if ispy3" by encoding.strtolocal()

[Yuya Nishihara]

# HG changeset patch
# User Yuya Nishihara <yuya at tcha.org>
# Date 1517026189 -32400
#      Sat Jan 27 13:09:49 2018 +0900
# Node ID f4250fa75585535cd97f378d27b4d999d4ccc359
# Parent  c8e2d6ed1f9ea4eee7b28250b5aff22433d538b6
py3: replace "if ispy3" by encoding.strtolocal()

diff --git a/mercurial/lock.py b/mercurial/lock.py
--- a/mercurial/lock.py
+++ b/mercurial/lock.py
@@ -30,9 +30,7 @@ def _getlockprefix():
     confidence. Typically it's just hostname. On modern linux, we include an
     extra Linux-specific pid namespace identifier.
     """
-    result = socket.gethostname()
-    if pycompat.ispy3:
-        result = result.encode(pycompat.sysstr(encoding.encoding), 'replace')
+    result = encoding.strtolocal(socket.gethostname())
     if pycompat.sysplatform.startswith('linux'):
         try:
             result += '/%x' % os.stat('/proc/self/ns/pid').st_ino
diff --git a/mercurial/ui.py b/mercurial/ui.py
--- a/mercurial/ui.py
+++ b/mercurial/ui.py
@@ -1509,11 +1509,7 @@ class ui(object):
                                ''.join(exconly))
             else:
                 output = traceback.format_exception(exc[0], exc[1], exc[2])
-                data = r''.join(output)
-                if pycompat.ispy3:
-                    enc = pycompat.sysstr(encoding.encoding)
-                    data = data.encode(enc, errors=r'replace')
-                self.write_err(data)
+                self.write_err(encoding.strtolocal(r''.join(output)))
         return self.tracebackflag or force
 
     def geteditor(self):