fix errors under CPython 3.4 on Windows

2 files changed, 8 insertions, 1 deletions

diff --git a/src/virtualenv/util/path/_pathlib/__init__.py b/src/virtualenv/util/path/_pathlib/__init__.py
index 3b18d3d..29a8c6b 100644
--- a/src/virtualenv/util/path/_pathlib/__init__.py
+++ b/src/virtualenv/util/path/_pathlib/__init__.py
@@ -28,6 +28,11 @@ if six.PY3:
                 with self.open(mode="w", encoding=encoding, errors=errors) as f:
                     return f.write(data)
 
+            def mkdir(self, mode=0o777, parents=False, exist_ok=False):
+                if exist_ok and self.exists():
+                    return
+                super(type(BuiltinPath()), self).mkdir(mode, parents)
+
 
 else:
     if sys.platform == "win32":
diff --git a/tests/unit/interpreters/create/test_creator.py b/tests/unit/interpreters/create/test_creator.py
index 9ca3c37..4a58d31 100644
--- a/tests/unit/interpreters/create/test_creator.py
+++ b/tests/unit/interpreters/create/test_creator.py
@@ -81,7 +81,7 @@ def system():
 @pytest.mark.parametrize(
     "use_venv", [False, True] if six.PY3 else [False], ids=["no_venv", "venv"] if six.PY3 else ["no_venv"]
 )
-def test_create_no_seed(python, use_venv, global_access, system, coverage_env, special_name_dir):
+def test_create(python, use_venv, global_access, system, coverage_env, special_name_dir):
     dest = special_name_dir
     cmd = [
         "-v",
@@ -190,6 +190,8 @@ def test_debug_bad_virtualenv(tmp_path):
 )
 @pytest.mark.parametrize("clear", [True, False], ids=["clear", "no_clear"])
 def test_create_clear_resets(tmp_path, use_venv, clear):
+    if sys.version_info[0:2] == (3, 4) and use_venv and clear is False and CURRENT.implementation == "CPython":
+        pytest.skip("python 3.4 does not support overwrite venv without clear")
     marker = tmp_path / "magic"
     cmd = [str(tmp_path), "--seeder", "none", "--creator", "venv" if use_venv else "builtin"]
     run_via_cli(cmd)