bpo-37364: Use io.open_code() to read .pth files (GH-14299)

https://bugs.python.org/issue37364

Lib/site.py

@@ -73,6 +73,7 @@ import sys
 import os
 import builtins
 import _sitebuiltins
+import io
 
 # Prefixes for site-packages; add additional prefixes like /usr/local here
 PREFIXES = [sys.prefix, sys.exec_prefix]
@@ -156,7 +157,7 @@ def addpackage(sitedir, name, known_paths):
         reset = False
     fullname = os.path.join(sitedir, name)
     try:
-        f = open(fullname, "r")
+        f = io.TextIOWrapper(io.open_code(fullname))
     except OSError:
         return
     with f:

Misc/NEWS.d/next/Security/2019-06-21-14-42-53.bpo-37364.IIRc2s.rst

@@ -0,0 +1 @@
+:func:`io.open_code` is now used when reading :file:`.pth` files.