diff --git a/subcmds/cherry_pick.py b/subcmds/cherry_pick.py
index 8da3a75..7890af4 100644
--- a/subcmds/cherry_pick.py
+++ b/subcmds/cherry_pick.py
@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import sys, re, string, random, os
+import sys, re
 from command import Command
 from git_command import GitCommand
 
diff --git a/subcmds/download.py b/subcmds/download.py
index 0ea45c3..0abe90d 100644
--- a/subcmds/download.py
+++ b/subcmds/download.py
@@ -13,7 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 import re
 import sys
 
diff --git a/subcmds/grep.py b/subcmds/grep.py
index 1cb5650..0dc8f9f 100644
--- a/subcmds/grep.py
+++ b/subcmds/grep.py
@@ -14,7 +14,6 @@
 # limitations under the License.
 
 import sys
-from optparse import SUPPRESS_HELP
 from color import Coloring
 from command import PagedCommand
 from git_command import git_require, GitCommand
diff --git a/subcmds/rebase.py b/subcmds/rebase.py
index 20662b1..2c1752d 100644
--- a/subcmds/rebase.py
+++ b/subcmds/rebase.py
@@ -17,8 +17,6 @@
 
 from command import Command
 from git_command import GitCommand
-from git_refs import GitRefs, HEAD, R_HEADS, R_TAGS, R_PUB, R_M
-from error import GitError
 
 class Rebase(Command):
   common = True