Remove unused compat.native_str

src/pip/_internal/utils/compat.py

@@ -41,7 +41,7 @@ except ImportError:
 
 
 __all__ = [
-    "ipaddress", "uses_pycache", "console_to_str", "native_str",
+    "ipaddress", "uses_pycache", "console_to_str",
     "get_path_uid", "stdlib_pkgs", "WINDOWS", "samefile", "get_terminal_size",
     "get_extension_suffixes",
 ]
@@ -159,22 +159,6 @@ def console_to_str(data):
     return str_to_display(data, desc='Subprocess output')
 
 
-if PY2:
-    def native_str(s, replace=False):
-        # type: (str, bool) -> str
-        # Replace is ignored -- unicode to UTF-8 can't fail
-        if isinstance(s, text_type):
-            return s.encode('utf-8')
-        return s
-
-else:
-    def native_str(s, replace=False):
-        # type: (str, bool) -> str
-        if isinstance(s, bytes):
-            return s.decode('utf-8', 'replace' if replace else 'strict')
-        return s
-
-
 def get_path_uid(path):
     # type: (str) -> int
     """

tests/unit/test_compat.py

@@ -10,7 +10,6 @@ from pip._internal.utils.compat import (
     console_to_str,
     expanduser,
     get_path_uid,
-    native_str,
     str_to_display,
 )
 
@@ -128,13 +127,6 @@ def test_console_to_str_warning(monkeypatch):
     console_to_str(some_bytes)
 
 
-def test_to_native_str_type():
-    some_bytes = b"test\xE9 et approuv\xC3\xE9"
-    some_unicode = b"test\xE9 et approuv\xE9".decode('iso-8859-15')
-    assert isinstance(native_str(some_bytes, True), str)
-    assert isinstance(native_str(some_unicode, True), str)
-
-
 @pytest.mark.parametrize("home,path,expanded", [
     ("/Users/test", "~", "/Users/test"),
     ("/Users/test", "~/.cache", "/Users/test/.cache"),