Revert "also disallow altsep beside pathsep inside paths"

This reverts commit 524d95e.

src/virtualenv/create/creator.py

@@ -117,12 +117,11 @@ def non_write_able(dest, value):
                     encoding, "".join(refused.keys()), raw_value
                 )
             )
-        for char in (i for i in (os.pathsep, os.altsep) if i is not None):
-            if char in raw_value:
-                raise ArgumentTypeError(
-                    "destination {!r} must not contain the path separator ({}) as this would break "
-                    "the activation scripts".format(raw_value, char)
-                )
+        if os.pathsep in raw_value:
+            raise ArgumentTypeError(
+                "destination {!r} must not contain the path separator ({}) as this would break "
+                "the activation scripts".format(raw_value, os.pathsep)
+            )
 
         value = Path(raw_value)
         if value.exists() and value.is_file():

tests/unit/create/test_creator.py

@@ -25,13 +25,12 @@
 CURRENT = PythonInfo.current_system()
 
 
-@pytest.mark.parametrize("sep", [i for i in (os.pathsep, os.altsep) if i is not None])
-def test_os_path_sep_not_allowed(tmp_path, capsys, sep):
-    target = "{}{}".format(str(tmp_path / "a"), "{}b".format(sep))
+def test_os_path_sep_not_allowed(tmp_path, capsys):
+    target = str(tmp_path / "a{}b".format(os.pathsep))
     err = _non_success_exit_code(capsys, target)
     msg = (
         "destination {!r} must not contain the path separator ({}) as this"
-        " would break the activation scripts".format(target, sep)
+        " would break the activation scripts".format(target, os.pathsep)
     )
     assert msg in err, err