diff --git a/mercurial/hgweb/hgweb_mod.py b/mercurial/hgweb/hgweb_mod.py
--- a/mercurial/hgweb/hgweb_mod.py
+++ b/mercurial/hgweb/hgweb_mod.py
@@ -68,7 +68,8 @@ class hgweb(object):
 
     def run(self):
         if not os.environ.get('GATEWAY_INTERFACE', '').startswith("CGI/1."):
-            raise RuntimeError("This function is only intended to be called while running as a CGI script.")
+            raise RuntimeError("This function is only intended to be "
+                               "called while running as a CGI script.")
         import mercurial.hgweb.wsgicgi as wsgicgi
         wsgicgi.launch(self)
 
diff --git a/mercurial/hgweb/hgwebdir_mod.py b/mercurial/hgweb/hgwebdir_mod.py
--- a/mercurial/hgweb/hgwebdir_mod.py
+++ b/mercurial/hgweb/hgwebdir_mod.py
@@ -92,7 +92,8 @@ class hgwebdir(object):
 
     def run(self):
         if not os.environ.get('GATEWAY_INTERFACE', '').startswith("CGI/1."):
-            raise RuntimeError("This function is only intended to be called while running as a CGI script.")
+            raise RuntimeError("This function is only intended to be "
+                               "called while running as a CGI script.")
         import mercurial.hgweb.wsgicgi as wsgicgi
         wsgicgi.launch(self)
 
diff --git a/mercurial/hgweb/server.py b/mercurial/hgweb/server.py
--- a/mercurial/hgweb/server.py
+++ b/mercurial/hgweb/server.py
@@ -69,8 +69,8 @@ class _hgwebhandler(object, BaseHTTPServ
             self._start_response("500 Internal Server Error", [])
             self._write("Internal Server Error")
             tb = "".join(traceback.format_exception(*sys.exc_info()))
-            self.log_error("Exception happened during processing request '%s':\n%s",
-                           self.path, tb)
+            self.log_error("Exception happened during processing "
+                           "request '%s':\n%s", self.path, tb)
 
     def do_GET(self):
         self.do_POST()
@@ -126,7 +126,8 @@ class _hgwebhandler(object, BaseHTTPServ
 
     def send_headers(self):
         if not self.saved_status:
-            raise AssertionError("Sending headers before start_response() called")
+            raise AssertionError("Sending headers before "
+                                 "start_response() called")
         saved_status = self.saved_status.split(None, 1)
         saved_status[0] = int(saved_status[0])
         self.send_response(*saved_status)
@@ -163,7 +164,8 @@ class _hgwebhandler(object, BaseHTTPServ
             self.send_headers()
         if self.length is not None:
             if len(data) > self.length:
-                raise AssertionError("Content-length header sent, but more bytes than specified are being written.")
+                raise AssertionError("Content-length header sent, but more "
+                                     "bytes than specified are being written.")
             self.length = self.length - len(data)
         self.wfile.write(data)
         self.wfile.flush()
diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -1402,7 +1402,9 @@ class localrepository(repo.repository):
                 cg = remote.changegroup(fetch, 'pull')
             else:
                 if not remote.capable('changegroupsubset'):
-                    raise util.Abort(_("Partial pull cannot be done because other repository doesn't support changegroupsubset."))
+                    raise util.Abort(_("Partial pull cannot be done because "
+                                       "other repository doesn't support "
+                                       "changegroupsubset."))
                 cg = remote.changegroupsubset(fetch, heads, 'pull')
             return self.addchangegroup(cg, 'pull', remote.url())
         finally: