catch some resource leaks

pkg_resources/__init__.py

@@ -1459,7 +1459,8 @@ class NullProvider:
         script_filename = self._fn(self.egg_info, script)
         namespace['__file__'] = script_filename
         if os.path.exists(script_filename):
-            source = open(script_filename).read()
+            with open(script_filename) as fid:
+                source = fid.read()
             code = compile(source, script_filename, 'exec')
             exec(code, namespace, namespace)
         else:

setuptools/launch.py

@@ -25,7 +25,8 @@ def run():
     sys.argv[:] = sys.argv[1:]
 
     open_ = getattr(tokenize, 'open', open)
-    script = open_(script_name).read()
+    with open_(script_name) as fid:
+        script = fid.read()
     norm_script = script.replace('\\r\\n', '\\n')
     code = compile(norm_script, script_name, 'exec')
     exec(code, namespace)

setuptools/msvc.py

@@ -643,8 +643,10 @@ class RegistryInfo:
         """
         key_read = winreg.KEY_READ
         openkey = winreg.OpenKey
+        closekey = winreg.CloseKey
         ms = self.microsoft
         for hkey in self.HKEYS:
+            bkey = None
             try:
                 bkey = openkey(hkey, ms(key), 0, key_read)
             except (OSError, IOError):
@@ -659,6 +661,9 @@ class RegistryInfo:
                 return winreg.QueryValueEx(bkey, name)[0]
             except (OSError, IOError):
                 pass
+            finally:
+                if bkey:
+                    closekey(bkey)
 
 
 class SystemInfo:
@@ -726,21 +731,22 @@ class SystemInfo:
                     bkey = winreg.OpenKey(hkey, ms(key), 0, winreg.KEY_READ)
                 except (OSError, IOError):
                     continue
-                subkeys, values, _ = winreg.QueryInfoKey(bkey)
-                for i in range(values):
-                    try:
-                        ver = float(winreg.EnumValue(bkey, i)[0])
-                        if ver not in vs_vers:
-                            vs_vers.append(ver)
-                    except ValueError:
-                        pass
-                for i in range(subkeys):
-                    try:
-                        ver = float(winreg.EnumKey(bkey, i))
-                        if ver not in vs_vers:
-                            vs_vers.append(ver)
-                    except ValueError:
-                        pass
+                with bkey:
+                    subkeys, values, _ = winreg.QueryInfoKey(bkey)
+                    for i in range(values):
+                        try:
+                            ver = float(winreg.EnumValue(bkey, i)[0])
+                            if ver not in vs_vers:
+                                vs_vers.append(ver)
+                        except ValueError:
+                            pass
+                    for i in range(subkeys):
+                        try:
+                            ver = float(winreg.EnumKey(bkey, i))
+                            if ver not in vs_vers:
+                                vs_vers.append(ver)
+                        except ValueError:
+                            pass
         return sorted(vs_vers)
 
     def find_programdata_vs_vers(self):