Remove unused code

Author: chrahunt

src/pip/_internal/pep425tags.py

@@ -13,12 +13,11 @@
 from pip._vendor.six import PY2
 
 import pip._internal.utils.glibc
-from pip._internal.utils.compat import get_extension_suffixes
 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
 
 if MYPY_CHECK_RUNNING:
     from typing import (
-        Tuple, Callable, List, Optional, Union, Dict, Set
+        Tuple, Callable, List, Optional, Union, Dict
     )
 
     Pep425Tag = Tuple[str, str, str]

src/pip/_internal/utils/compat.py

@@ -43,7 +43,6 @@
 __all__ = [
     "ipaddress", "uses_pycache", "console_to_str",
     "get_path_uid", "stdlib_pkgs", "WINDOWS", "samefile", "get_terminal_size",
-    "get_extension_suffixes",
 ]
 
 
@@ -189,19 +188,6 @@ def get_path_uid(path):
     return file_uid
 
 
-if PY2:
-    from imp import get_suffixes
-
-    def get_extension_suffixes():
-        return [suffix[0] for suffix in get_suffixes()]
-
-else:
-    from importlib.machinery import EXTENSION_SUFFIXES
-
-    def get_extension_suffixes():
-        return EXTENSION_SUFFIXES
-
-
 def expanduser(path):
     # type: (str) -> str
     """