Use makedirs with future compatibility throughout setuptools. Ref #1083.

setuptools/command/easy_install.py

@@ -59,7 +59,7 @@ from pkg_resources import (
     Distribution, PathMetadata, EggMetadata, WorkingSet, DistributionNotFound,
     VersionConflict, DEVELOP_DIST,
 )
-import pkg_resources
+import pkg_resources.py31compat
 
 # Turn on PEP440Warnings
 warnings.filterwarnings("default", category=pkg_resources.PEP440Warning)
@@ -544,8 +544,7 @@ class easy_install(Command):
             if ok_exists:
                 os.unlink(ok_file)
             dirname = os.path.dirname(ok_file)
-            if not os.path.exists(dirname):
-                os.makedirs(dirname)
+            pkg_resources.py31compat.makedirs(dirname, exist_ok=True)
             f = open(pth_file, 'w')
         except (OSError, IOError):
             self.cant_write_to_target()

setuptools/sandbox.py

@@ -12,7 +12,7 @@ import textwrap
 from setuptools.extern import six
 from setuptools.extern.six.moves import builtins, map
 
-import pkg_resources
+import pkg_resources.py31compat
 
 if sys.platform.startswith('java'):
     import org.python.modules.posix.PosixModule as _os
@@ -26,6 +26,7 @@ _open = open
 from distutils.errors import DistutilsError
 from pkg_resources import working_set
 
+
 __all__ = [
     "AbstractSandbox", "DirectorySandbox", "SandboxViolation", "run_setup",
 ]
@@ -73,8 +74,7 @@ def override_temp(replacement):
     """
     Monkey-patch tempfile.tempdir with replacement, ensuring it exists
     """
-    if not os.path.isdir(replacement):
-        os.makedirs(replacement)
+    pkg_resources.py31compat.makedirs(replacement, exist_ok=True)
 
     saved = tempfile.tempdir
 

setuptools/tests/files.py

 import os
 
 
+import pkg_resources.py31compat
+
+
 def build_files(file_defs, prefix=""):
     """
     Build a set of files/directories, as described by the file_defs dictionary.
@@ -24,8 +27,7 @@ def build_files(file_defs, prefix=""):
     for name, contents in file_defs.items():
         full_name = os.path.join(prefix, name)
         if isinstance(contents, dict):
-            if not os.path.exists(full_name):
-                os.makedirs(full_name)
+            pkg_resources.py31compat.makedirs(full_name, exist_ok=True)
             build_files(contents, prefix=full_name)
         else:
             with open(full_name, 'w') as f:

setuptools/tests/test_manifest.py

@@ -10,6 +10,7 @@ import itertools
 from distutils import log
 from distutils.errors import DistutilsTemplateError
 
+import pkg_resources.py31compat
 from setuptools.command.egg_info import FileList, egg_info, translate_pattern
 from setuptools.dist import Distribution
 from setuptools.extern import six
@@ -361,8 +362,7 @@ class TestFileListTest(TempDirTestCase):
         for file in files:
             file = os.path.join(self.temp_dir, file)
             dirname, basename = os.path.split(file)
-            if not os.path.exists(dirname):
-                os.makedirs(dirname)
+            pkg_resources.py31compat.makedirs(dirname, exist_ok=True)
             open(file, 'w').close()
 
     def test_process_template_line(self):