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-rw-r--r--setuptools/command/build_py.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/setuptools/command/build_py.py b/setuptools/command/build_py.py
index a873d54b..779adf2a 100644
--- a/setuptools/command/build_py.py
+++ b/setuptools/command/build_py.py
@@ -5,6 +5,8 @@ import os
import sys
import fnmatch
import textwrap
+import io
+
try:
from setuptools.lib2to3_ex import Mixin2to3
@@ -157,7 +159,7 @@ class build_py(orig.build_py, Mixin2to3):
else:
return init_py
- f = open(init_py, 'rbU')
+ f = io.open(init_py, 'rb')
if 'declare_namespace'.encode() not in f.read():
from distutils.errors import DistutilsError