fix unused variables reported by pychecker

mercurial/changelog.py

@@ -58,7 +58,6 b' class appender:'
     def read(self, count=-1):
         '''only trick here is reads that span real file and data'''
         ret = ""
-        old_offset = self.offset
         if self.offset < self.size:
             s = self.fp.read(count)
             ret = s

mercurial/commands.py

@@ -8,7 +8,7 b''
 import demandimport; demandimport.enable()
 from node import *
 from i18n import _
-import bisect, os, re, sys, urllib, shlex, stat
+import bisect, os, re, sys, urllib, stat
 import ui, hg, util, revlog, bundlerepo, extensions
 import difflib, patch, time, help, mdiff, tempfile
 import errno, version, socket
@@ -2197,7 +2197,6 b' def remove(ui, repo, *pats, **opts):'
     Modified files and added files are not removed by default.  To
     remove them, use the -f/--force option.
     """
-    names = []
     if not opts['after'] and not pats:
         raise util.Abort(_('no files specified'))
     files, matchfn, anypats = cmdutil.matchpats(repo, pats, opts)
@@ -2659,7 +2658,6 b' def unbundle(ui, repo, fname1, *fnames, '
     bundle command.
     """
     fnames = (fname1,) + fnames
-    result = None
     for fname in fnames:
         if os.path.exists(fname):
             f = open(fname, "rb")

mercurial/util.py

@@ -616,7 +616,7 b' def rename(src, dst):'
     """forcibly rename a file"""
     try:
         os.rename(src, dst)
-    except OSError, err:
+    except OSError, err: # FIXME: check err (EEXIST ?)
         # on windows, rename to existing file is not allowed, so we
         # must delete destination first. but if file is open, unlink
         # schedules it for delete but does not delete it. rename