cleanup: avoid local vars shadowing imports

This will mute some pyflakes "import ... shadowed by loop variable" warnings.

mercurial/hgweb/hgweb_mod.py

@@ -392,5 +392,5 b' class hgweb(object):'
         }
 
     def check_perm(self, req, op):
-        for hook in permhooks:
-            hook(self, req, op)
+        for permhook in permhooks:
+            permhook(self, req, op)

mercurial/merge.py

@@ -10,7 +10,7 b' import struct'
 from node import nullid, nullrev, hex, bin
 from i18n import _
 from mercurial import obsolete
-import error, util, filemerge, copies, subrepo, worker, dicthelpers
+import error as errormod, util, filemerge, copies, subrepo, worker, dicthelpers
 import errno, os, shutil
 
 _pack = struct.pack
@@ -1011,7 +1011,7 b' def update(repo, node, branchmerge, forc'
             # but currently we are only checking the branch tips.
             try:
                 node = repo.branchtip(wc.branch())
-            except error.RepoLookupError:
+            except errormod.RepoLookupError:
                 if wc.branch() == "default": # no default branch!
                     node = repo.lookup("tip") # update to tip
                 else:

mercurial/obsolete.py

@@ -748,8 +748,8 b' def _computeobsoleteset(repo):'
     obs = set()
     getrev = repo.changelog.nodemap.get
     getphase = repo._phasecache.phase
-    for node in repo.obsstore.successors:
-        rev = getrev(node)
+    for n in repo.obsstore.successors:
+        rev = getrev(n)
         if rev is not None and getphase(repo, rev):
             obs.add(rev)
     return obs

mercurial/tagmerge.py

@@ -71,7 +71,7 b''
 #         - put blocks whose nodes come all from p2 first
 #     - write the tag blocks in the sorted order
 
-import tags
+import tags as tagsmod
 import util
 from node import nullid, hex
 from i18n import _
@@ -85,8 +85,8 b' def readtagsformerge(ui, repo, lines, fn'
     with each tag. Rhis is done because only the line numbers of the first
     parent are useful for merging
     '''
-    filetags = tags._readtaghist(ui, repo, lines, fn=fn, recode=None,
-                              calcnodelines=True)[1]
+    filetags = tagsmod._readtaghist(ui, repo, lines, fn=fn, recode=None,
+                                    calcnodelines=True)[1]
     for tagname, taginfo in filetags.items():
         if not keeplinenums:
             for el in taginfo: