diff --git a/anki/importing/anki2.py b/anki/importing/anki2.py
index d938f0ff4..dfd4f1a0d 100644
--- a/anki/importing/anki2.py
+++ b/anki/importing/anki2.py
@@ -340,7 +340,8 @@ insert or ignore into revlog values (?,?,?,?,?,?,?,?,?)""", revlog)
             dir = self.src.media.dir()
         path = os.path.join(dir, fname)
         try:
-            return open(path, "rb").read()
+            with open(path, "rb") as f:
+                return f.read()
         except (IOError, OSError):
             return
 
@@ -356,7 +357,8 @@ insert or ignore into revlog values (?,?,?,?,?,?,?,?,?)""", revlog)
         path = os.path.join(self.dst.media.dir(),
                             unicodedata.normalize("NFC", fname))
         try:
-            open(path, "wb").write(data)
+            with open(path, "wb") as f:
+                f.write(data)
         except (OSError, IOError):
             # the user likely used subdirectories
             pass
diff --git a/anki/importing/apkg.py b/anki/importing/apkg.py
index a91753f17..e31bc4b07 100644
--- a/anki/importing/apkg.py
+++ b/anki/importing/apkg.py
@@ -14,7 +14,8 @@ class AnkiPackageImporter(Anki2Importer):
         self.zip = z = zipfile.ZipFile(self.file)
         col = z.read("collection.anki2")
         colpath = tmpfile(suffix=".anki2")
-        open(colpath, "wb").write(col)
+        with open(colpath, "wb") as f:
+            f.write(col)
         self.file = colpath
         # we need the media dict in advance, and we'll need a map of fname ->
         # number to use during the import
@@ -34,7 +35,8 @@ class AnkiPackageImporter(Anki2Importer):
                 continue
             path = os.path.join(self.col.media.dir(), file)
             if not os.path.exists(path):
-                open(path, "wb").write(z.read(c))
+                with open(path, "wb") as f:
+                    f.write(z.read(c))
 
     def _srcMediaData(self, fname):
         if fname in self.nameToNum:
diff --git a/anki/latex.py b/anki/latex.py
index 75b9046b6..dc7408c73 100644
--- a/anki/latex.py
+++ b/anki/latex.py
@@ -127,12 +127,14 @@ package in the LaTeX header instead.""") % bad
         return
     finally:
         os.chdir(oldcwd)
+        log.close()
 
 def _errMsg(type, texpath):
     msg = (_("Error executing %s.") % type) + "<br>"
     msg += (_("Generated file: %s") % texpath) + "<br>"
     try:
-        log = open(namedtmp("latex_log.txt", rm=False)).read()
+        with open(namedtmp("latex_log.txt", rm=False)) as f:
+            log = f.read()
         if not log:
             raise Exception()
         msg += "<small><pre>" + html.escape(log) + "</pre></small>"
diff --git a/anki/media.py b/anki/media.py
index 0e53c0478..91b124a1f 100644
--- a/anki/media.py
+++ b/anki/media.py
@@ -138,7 +138,8 @@ create table meta (dirMod int, lastUsn int); insert into meta values (0, 0);
     # opath must be in unicode
 
     def addFile(self, opath):
-        return self.writeData(opath, open(opath, "rb").read())
+        with open(opath, "rb") as f:
+            return self.writeData(opath, f.read())
 
     def writeData(self, opath, data, typeHint=None):
         # if fname is a full path, use only the basename
@@ -171,11 +172,13 @@ create table meta (dirMod int, lastUsn int); insert into meta values (0, 0);
             path = os.path.join(self.dir(), fname)
             # if it doesn't exist, copy it directly
             if not os.path.exists(path):
-                open(path, "wb").write(data)
+                with open(path, "wb") as f:
+                    f.write(data)
                 return fname
             # if it's identical, reuse
-            if checksum(open(path, "rb").read()) == csum:
-                return fname
+            with open(path, "rb") as f:
+                if checksum(f.read()) == csum:
+                    return fname
             # otherwise, increment the index in the filename
             reg = " \((\d+)\)$"
             if not re.search(reg, root):
@@ -375,7 +378,8 @@ create table meta (dirMod int, lastUsn int); insert into meta values (0, 0);
         return int(os.stat(path).st_mtime)
 
     def _checksum(self, path):
-        return checksum(open(path, "rb").read())
+        with open(path, "rb") as f:
+            return checksum(f.read())
 
     def _changed(self):
         "Return dir mtime if it has changed since the last findChanges()"
@@ -553,7 +557,8 @@ create table meta (dirMod int, lastUsn int); insert into meta values (0, 0);
                 else:
                     name = unicodedata.normalize("NFC", name)
                 # save file
-                open(name, "wb").write(data)
+                with open(name, "wb") as f:
+                    f.write(data)
                 # update db
                 media.append((name, csum, self._mtime(name), 0))
                 cnt += 1
diff --git a/tests/test_exporting.py b/tests/test_exporting.py
index 61c417356..261e27dcc 100644
--- a/tests/test_exporting.py
+++ b/tests/test_exporting.py
@@ -68,7 +68,8 @@ def test_export_anki():
 @nose.with_setup(setup1)
 def test_export_ankipkg():
     # add a test file to the media folder
-    open(os.path.join(deck.media.dir(), "今日.mp3"), "w").write("test")
+    with open(os.path.join(deck.media.dir(), "今日.mp3"), "w") as f:
+        f.write("test")
     n = deck.newNote()
     n['Front'] = '[sound:今日.mp3]'
     deck.addNote(n)
diff --git a/tests/test_importing.py b/tests/test_importing.py
index 65e418a6e..00c8af53b 100644
--- a/tests/test_importing.py
+++ b/tests/test_importing.py
@@ -19,7 +19,8 @@ def test_anki2_mediadupes():
     mid = n.model()['id']
     tmp.addNote(n)
     # add that sound to media folder
-    open(os.path.join(tmp.media.dir(), "foo.mp3"), "w").write("foo")
+    with open(os.path.join(tmp.media.dir(), "foo.mp3"), "w") as f:
+        f.write("foo")
     tmp.close()
     # it should be imported correctly into an empty deck
     empty = getEmptyCol()
@@ -36,7 +37,8 @@ def test_anki2_mediadupes():
     # if the local file content is different, and import should trigger a
     # rename
     empty.remCards(empty.db.list("select id from cards"))
-    open(os.path.join(empty.media.dir(), "foo.mp3"), "w").write("bar")
+    with open(os.path.join(empty.media.dir(), "foo.mp3"), "w") as f:
+        f.write("bar")
     imp = Anki2Importer(empty, tmp.path)
     imp.run()
     assert sorted(os.listdir(empty.media.dir())) == [
@@ -46,7 +48,8 @@ def test_anki2_mediadupes():
     # if the localized media file already exists, we rewrite the note and
     # media
     empty.remCards(empty.db.list("select id from cards"))
-    open(os.path.join(empty.media.dir(), "foo.mp3"), "w").write("bar")
+    with open(os.path.join(empty.media.dir(), "foo.mp3"), "w") as f:
+        f.write("bar")
     imp = Anki2Importer(empty, tmp.path)
     imp.run()
     assert sorted(os.listdir(empty.media.dir())) == [
@@ -70,7 +73,8 @@ def test_apkg():
     assert os.listdir(tmp.media.dir()) == ['foo.wav']
     # but if the local file has different data, it will rename
     tmp.remCards(tmp.db.list("select id from cards"))
-    open(os.path.join(tmp.media.dir(), "foo.wav"), "w").write("xyz")
+    with open(os.path.join(tmp.media.dir(), "foo.wav"), "w") as f:
+        f.write("xyz")
     imp = AnkiPackageImporter(tmp, apkg)
     imp.run()
     assert len(os.listdir(tmp.media.dir())) == 2
diff --git a/tests/test_media.py b/tests/test_media.py
index ca6d19e2b..e8198a543 100644
--- a/tests/test_media.py
+++ b/tests/test_media.py
@@ -12,13 +12,15 @@ def test_add():
     d = getEmptyCol()
     dir = tempfile.mkdtemp(prefix="anki")
     path = os.path.join(dir, "foo.jpg")
-    open(path, "w").write("hello")
+    with open(path, "w") as f:
+        f.write("hello")
     # new file, should preserve name
     assert d.media.addFile(path) == "foo.jpg"
     # adding the same file again should not create a duplicate
     assert d.media.addFile(path) == "foo.jpg"
     # but if it has a different md5, it should
-    open(path, "w").write("world")
+    with open(path, "w") as f:
+        f.write("world")
     assert d.media.addFile(path) == "foo (1).jpg"
 
 def test_strings():
@@ -61,7 +63,8 @@ def test_deckIntegration():
     f['Front'] = "one"; f['Back'] = "<img src='fake2.png'>"
     d.addNote(f)
     # and add another file which isn't used
-    open(os.path.join(d.media.dir(), "foo.jpg"), "w").write("test")
+    with open(os.path.join(d.media.dir(), "foo.jpg"), "w") as f:
+        f.write("test")
     # check media
     ret = d.media.check()
     assert ret[0] == ["fake2.png"]
@@ -78,7 +81,8 @@ def test_changes():
     # add a file
     dir = tempfile.mkdtemp(prefix="anki")
     path = os.path.join(dir, "foo.jpg")
-    open(path, "w").write("hello")
+    with open(path, "w") as f:
+        f.write("hello")
     time.sleep(1)
     path = d.media.addFile(path)
     # should have been logged
@@ -87,12 +91,14 @@ def test_changes():
     assert not list(removed())
     # if we modify it, the cache won't notice
     time.sleep(1)
-    open(path, "w").write("world")
+    with open(path, "w") as f:
+        f.write("world")
     assert len(list(added())) == 1
     assert not list(removed())
     # but if we add another file, it will
     time.sleep(1)
-    open(path+"2", "w").write("yo")
+    with open(path+"2", "w") as f:
+        f.write("yo")
     d.media.findChanges()
     assert len(list(added())) == 2
     assert not list(removed())
diff --git a/tests/test_stats.py b/tests/test_stats.py
index 712bd4bf4..b7212d1e5 100644
--- a/tests/test_stats.py
+++ b/tests/test_stats.py
@@ -26,5 +26,6 @@ def test_graphs():
     d = aopen(os.path.expanduser("~/test.anki2"))
     g = d.stats()
     rep = g.report()
-    open(os.path.expanduser("~/test.html"), "w").write(rep)
+    with open(os.path.expanduser("~/test.html"), "w") as f:
+        f.write(rep)
     return