diff --git a/git_command.py b/git_command.py
index 39f795f..e5e28f3 100644
--- a/git_command.py
+++ b/git_command.py
@@ -88,7 +88,7 @@
       ver_str = git.version()
       if ver_str.startswith('git version '):
         _git_version = tuple(
-          map(lambda x: int(x),
+          map(int,
             ver_str[len('git version '):].strip().split('-')[0].split('.')[0:3]
           ))
       else:
@@ -110,7 +110,7 @@
   if min_version <= git_version:
     return True
   if fail:
-    need = '.'.join(map(lambda x: str(x), min_version))
+    need = '.'.join(map(str, min_version))
     print >>sys.stderr, 'fatal: git %s or later required' % need
     sys.exit(1)
   return False
diff --git a/git_config.py b/git_config.py
index 6589b19..ea782a1 100644
--- a/git_config.py
+++ b/git_config.py
@@ -537,7 +537,7 @@
     self.url = self._Get('url')
     self.review = self._Get('review')
     self.projectname = self._Get('projectname')
-    self.fetch = map(lambda x: RefSpec.FromString(x),
+    self.fetch = map(RefSpec.FromString,
                      self._Get('fetch', all_keys=True))
     self._review_url = None
 
@@ -657,7 +657,7 @@
     self._Set('url', self.url)
     self._Set('review', self.review)
     self._Set('projectname', self.projectname)
-    self._Set('fetch', map(lambda x: str(x), self.fetch))
+    self._Set('fetch', map(str, self.fetch))
 
   def _Set(self, key, value):
     key = 'remote.%s.%s' % (self.name, key)
diff --git a/main.py b/main.py
index 10e1cf8..6236dd3 100755
--- a/main.py
+++ b/main.py
@@ -195,12 +195,12 @@
     sys.exit(1)
 
   exp = _CurrentWrapperVersion()
-  ver = tuple(map(lambda x: int(x), ver.split('.')))
+  ver = tuple(map(int, ver.split('.')))
   if len(ver) == 1:
     ver = (0, ver[0])
 
+  exp_str = '.'.join(map(str, exp))
   if exp[0] > ver[0] or ver < (0, 4):
-    exp_str = '.'.join(map(lambda x: str(x), exp))
     print >>sys.stderr, """
 !!! A new repo command (%5s) is available.    !!!
 !!! You must upgrade before you can continue:   !!!
@@ -210,7 +210,6 @@
     sys.exit(1)
 
   if exp > ver:
-    exp_str = '.'.join(map(lambda x: str(x), exp))
     print >>sys.stderr, """
 ... A new repo command (%5s) is available.
 ... You should upgrade soon:
@@ -272,7 +271,7 @@
     _user_agent = 'git-repo/%s (%s) git/%s Python/%d.%d.%d' % (
       repo_version,
       os_name,
-      '.'.join(map(lambda d: str(d), git.version_tuple())),
+      '.'.join(map(str, git.version_tuple())),
       py_version[0], py_version[1], py_version[2])
   return _user_agent
 
diff --git a/project.py b/project.py
index cdb4ecf..f72b1c8 100644
--- a/project.py
+++ b/project.py
@@ -1175,7 +1175,7 @@
     cmd = ['fetch', remote.name]
     cmd.append('refs/changes/%2.2d/%d/%d' \
                % (change_id % 100, change_id, patch_id))
-    cmd.extend(map(lambda x: str(x), remote.fetch))
+    cmd.extend(map(str, remote.fetch))
     if GitCommand(self, cmd, bare=True).Wait() != 0:
       return None
     return DownloadedChange(self,