diff --git a/t/alwaystest.do b/t/alwaystest.do
index 37bf270..17c01cb 100644
--- a/t/alwaystest.do
+++ b/t/alwaystest.do
@@ -5,21 +5,21 @@ redo t/always1
 cd t
 [ "$(wc -l <always1.log)" -eq 1 ] || exit 11
 
-# This shouldn't rebuild, but because other people might be running flush-cache.sh
+# This shouldn't rebuild, but because other people might be running flush-cache.py
 # in parallel with us, we can't be 100% sure it won't.  So don't test it.
 #redo-ifchange always1
 #[ "$(wc -l <always1.log)" -eq 1 ] || exit 21
 
-./flush-cache.sh
+./flush-cache.py
 redo-ifchange always1
 . ./skip-if-minimal-do.sh
 [ "$(wc -l <always1.log)" -eq 2 ] || exit 31
 
-./flush-cache.sh
+./flush-cache.py
 redo-ifchange always1
 [ "$(wc -l <always1.log)" -eq 3 ] || exit 41
 
 cd ..
-./t/flush-cache.sh
+./t/flush-cache.py
 redo-ifchange t/always1
 [ "$(wc -l <t/always1.log)" -eq 4 ] || exit 51
diff --git a/t/chdirtest.do b/t/chdirtest.do
index 8d163fb..1a8c51c 100644
--- a/t/chdirtest.do
+++ b/t/chdirtest.do
@@ -4,15 +4,15 @@ rm -f chdir1
 redo chdir2
 redo chdir3
 
-./flush-cache.sh
+./flush-cache.py
 redo-ifchange chdir3
 
 rm -f chdir1
-./flush-cache.sh
+./flush-cache.py
 redo-ifchange chdir3
 [ -e chdir1 ] || exit 77
 
 rm -f chdir1
-./flush-cache.sh
+./flush-cache.py
 redo-ifchange chdir3
 [ -e chdir1 ] || exit 78
diff --git a/t/deps/basic/test.do b/t/deps/basic/test.do
index b35e523..f3e649e 100644
--- a/t/deps/basic/test.do
+++ b/t/deps/basic/test.do
@@ -1,10 +1,10 @@
 rm -f *.out *.log
 
-../../flush-cache.sh
+../../flush-cache.py
 redo-ifchange 1.out 2.out
 [ "$(cat 1.log | wc -l)" -eq 1 ] || exit 55
 [ "$(cat 2.log | wc -l)" -eq 1 ] || exit 56
-../../flush-cache.sh
+../../flush-cache.py
 touch 1.in
 redo-ifchange 1.out 2.out
 [ "$(cat 2.log | wc -l)" -eq 1 ] || exit 58
diff --git a/t/deps/dirtest/test.do b/t/deps/dirtest/test.do
index 08541ed..f49fe7b 100644
--- a/t/deps/dirtest/test.do
+++ b/t/deps/dirtest/test.do
@@ -1,11 +1,11 @@
 rm -f log dir1/log dir1/stinky
 touch t1.do
-../../flush-cache.sh
+../../flush-cache.py
 redo t1
 touch t1.do
-../../flush-cache.sh
+../../flush-cache.py
 redo t1
-../../flush-cache.sh
+../../flush-cache.py
 redo-ifchange t1
 C1="$(wc -l <dir1/log)"
 C2="$(wc -l <log)"
diff --git a/t/deps/doublestatic.do b/t/deps/doublestatic.do
index 13cb2b6..6de4676 100644
--- a/t/deps/doublestatic.do
+++ b/t/deps/doublestatic.do
@@ -3,7 +3,7 @@ rm -f static.log
 redo static1 static2
 
 touch static.in
-../flush-cache.sh
+../flush-cache.py
 redo-ifchange static1 static2
 
 COUNT=$(wc -l <static.log)
diff --git a/t/deps/gentest.do b/t/deps/gentest.do
index d457b76..bc7d8bc 100644
--- a/t/deps/gentest.do
+++ b/t/deps/gentest.do
@@ -1,19 +1,19 @@
 rm -f genfile2 genfile2.do genfile.log
 
 echo echo hello >genfile2.do
-../flush-cache.sh
+../flush-cache.py
 redo genfile1
 
 # this will cause a rebuild:
 #      genfile1 depends on genfile2 depends on genfile2.do
 rm -f genfile2.do
-../flush-cache.sh
+../flush-cache.py
 redo-ifchange genfile1
 
 # but genfile2.do was gone last time, so genfile2 no longer depends on it.
 # thus, it can be considered up-to-date.  Prior versions of redo had a bug
 # where the dependency on genfile2.do was never dropped.
-../flush-cache.sh
+../flush-cache.py
 redo-ifchange genfile1
 
 COUNT=$(wc -l <genfile.log)
diff --git a/t/deps/test1.do b/t/deps/test1.do
index 6cfc2bb..232a994 100644
--- a/t/deps/test1.do
+++ b/t/deps/test1.do
@@ -6,7 +6,7 @@ if [ -e t1a ]; then
 else
 	BEFORE=
 fi
-../flush-cache.sh
+../flush-cache.py
 redo-ifchange t1a  # it definitely had to rebuild because t1dep changed
 AFTER="$(cat t1a)"
 if [ "$BEFORE" = "$AFTER" ]; then
diff --git a/t/flush-cache.py b/t/flush-cache.py
new file mode 100755
index 0000000..fe846f5
--- /dev/null
+++ b/t/flush-cache.py
@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+
+import os, os.path, sqlite3, sys
+
+if "DO_BUILT" in os.environ:
+    sys.exit(0)
+
+print >>sys.stderr, "Flushing redo cache..."
+
+db_file = os.path.join(os.environ["REDO_BASE"], ".redo", "db.sqlite3")
+db_con = sqlite3.connect(db_file, timeout=5000)
+
+db_con.executescript("pragma synchronous = off;"
+                     "update Files set checked_runid=checked_runid-1, "
+                     "       changed_runid=changed_runid-1, "
+                     "       failed_runid=failed_runid-1;")
+
+db_con.commit()
+
+db_con.close()
+
diff --git a/t/flush-cache.sh b/t/flush-cache.sh
deleted file mode 100755
index 7bd22fa..0000000
--- a/t/flush-cache.sh
+++ /dev/null
@@ -1,12 +0,0 @@
-#!/bin/sh
-#echo "Flushing redo cache..." >&2
-if [ -z "$DO_BUILT" ]; then
-	(
-		echo ".timeout 5000"
-		echo "pragma synchronous = off;"
-		echo "update Files set checked_runid=checked_runid-1, " \
-		     "       changed_runid=changed_runid-1, " \
-		     "       failed_runid=failed_runid-1;"
-	) | sqlite3  "$REDO_BASE/.redo/db.sqlite3"
-fi
-
diff --git a/t/ifcreate-test.do b/t/ifcreate-test.do
index 73586f1..42a9018 100644
--- a/t/ifcreate-test.do
+++ b/t/ifcreate-test.do
@@ -10,11 +10,11 @@ for d in 1 2; do
 	[ "$(wc -l <ifcreate$d.log)" -eq 1 ] || exit ${d}1
 	redo-ifchange ifcreate$d
 	[ "$(wc -l <ifcreate$d.log)" -eq 1 ] || exit ${d}2
-	./flush-cache.sh
+	./flush-cache.py
 	touch ifcreate$d.dep
 	redo-ifchange ifcreate$d
 	[ "$(wc -l <ifcreate$d.log)" -eq 2 ] || exit ${d}3
-	./flush-cache.sh
+	./flush-cache.py
 	rm ifcreate$d.dep
 	redo-ifchange ifcreate$d
 	[ "$(wc -l <ifcreate$d.log)" -eq 3 ] || exit ${d}4
diff --git a/t/makedir2.do b/t/makedir2.do
index 9fa784c..9f82f99 100644
--- a/t/makedir2.do
+++ b/t/makedir2.do
@@ -2,7 +2,7 @@
 rm -f makedir.log
 redo makedir
 touch makedir/outfile
-./flush-cache.sh
+./flush-cache.py
 redo-ifchange makedir
 COUNT=$(wc -l <makedir.log)
 [ "$COUNT" -eq 1 ] || exit 99
diff --git a/t/stamp/stamptest.do b/t/stamp/stamptest.do
index 19a2f5a..97d9ac3 100644
--- a/t/stamp/stamptest.do
+++ b/t/stamp/stamptest.do
@@ -1,32 +1,32 @@
 rm -f stampy usestamp usestamp2 stampy.log usestamp.log usestamp2.log
 echo one >inp
 
-../flush-cache.sh
+../flush-cache.py
 redo stampy
 [ "$(wc -l <stampy.log)" -eq 1 ] || exit 11
 
 # stampy already exists, so we won't generate it a second time, even though
 # usestamp depends on it.
-../flush-cache.sh
+../flush-cache.py
 redo-ifchange usestamp
 [ "$(wc -l <stampy.log)" -eq 1 ] || exit 21
 [ "$(wc -l <usestamp.log)" -eq 1 ] || exit 12
 
-../flush-cache.sh
+../flush-cache.py
 redo stampy
 . ../skip-if-minimal-do.sh
 [ "$(wc -l <stampy.log)" -eq 2 ] || exit 31
 [ "$(wc -l <usestamp.log)" -eq 1 ] || exit 32
 
 # same as above: stampy is already up-to-date, so it won't be redone.
-../flush-cache.sh
+../flush-cache.py
 redo-ifchange usestamp
 [ "$(wc -l <stampy.log)" -eq 2 ] || exit 41
 [ "$(wc -l <usestamp.log)" -eq 1 ] || exit 42
 
 # stampy depends on bob, so we'll have to rebuild stampy automatically.  But
 # stampy's checksum will still be identical.
-../flush-cache.sh
+../flush-cache.py
 redo bob
 redo-ifchange usestamp
 [ "$(wc -l <stampy.log)" -eq 3 ] || exit 43
@@ -34,13 +34,13 @@ redo-ifchange usestamp
 
 # Make sure the previous step correctly marked stampy and usestamp as up-to-date
 # even though *neither* of them is newer than bob.
-../flush-cache.sh
+../flush-cache.py
 redo-ifchange usestamp
 [ "$(wc -l <stampy.log)" -eq 3 ] || exit 45
 [ "$(wc -l <usestamp.log)" -eq 1 ] || exit 46
 
 # now we're changing the contents of stampy.
-../flush-cache.sh
+../flush-cache.py
 echo two >inp
 redo stampy
 [ "$(wc -l <stampy.log)" -eq 4 ] || exit 51
@@ -53,7 +53,7 @@ redo-ifchange usestamp usestamp2
 
 # when we delete the file and it gets regenerated identically, it's as good as
 # never having been deleted.  So usestamp won't need to change.
-../flush-cache.sh
+../flush-cache.py
 rm -f stampy
 redo-ifchange usestamp usestamp2
 [ "$(wc -l <stampy.log)" -eq 5 ] || exit 71
@@ -61,7 +61,7 @@ redo-ifchange usestamp usestamp2
 [ "$(wc -l <usestamp2.log)" -eq 1 ] || exit 73
 
 # this simple test used to cause a deadlock.
-../flush-cache.sh
+../flush-cache.py
 rm -f stampy
 redo-ifchange stampy
 [ "$(wc -l <stampy.log)" -eq 6 ] || exit 74