diff -r 90dab7696e89 Lib/modulefinder.py
--- a/Lib/modulefinder.py	Thu May 29 01:46:16 2014 -0400
+++ b/Lib/modulefinder.py	Fri May 30 00:10:00 2014 +0300
@@ -109,16 +109,16 @@
 
     def run_script(self, pathname):
         self.msg(2, "run_script", pathname)
-        fp = open(pathname, READ_MODE)
-        stuff = ("", "r", imp.PY_SOURCE)
-        self.load_module('__main__', fp, pathname, stuff)
+        with open(pathname, READ_MODE) as fp:
+            stuff = ("", "r", imp.PY_SOURCE)
+            self.load_module('__main__', fp, pathname, stuff)
 
     def load_file(self, pathname):
         dir, name = os.path.split(pathname)
         name, ext = os.path.splitext(name)
-        fp = open(pathname, READ_MODE)
-        stuff = (ext, "r", imp.PY_SOURCE)
-        self.load_module(name, fp, pathname, stuff)
+        with open(pathname, READ_MODE) as fp:
+            stuff = (ext, "r", imp.PY_SOURCE)
+            self.load_module(name, fp, pathname, stuff)
 
     def import_hook(self, name, caller=None, fromlist=None, level=-1):
         self.msg(3, "import_hook", name, caller, fromlist, level)
@@ -461,6 +461,8 @@
         fp, buf, stuff = self.find_module("__init__", m.__path__)
         self.load_module(fqname, fp, buf, stuff)
         self.msgout(2, "load_package ->", m)
+        if fp:
+            fp.close()
         return m
 
     def add_module(self, fqname):