Simplify native module detection

iscc_core/check.py

@@ -1,44 +1,10 @@
 # -*- coding: utf-8 -*-
 """Inspect lib environment/installation"""
-import importlib.machinery
 import inspect
 
 
 __all__ = ["turbo"]
 
-EXTENSION_SUFFIXES = tuple(sf.lstrip(".") for sf in importlib.machinery.EXTENSION_SUFFIXES)
-
-
-def suffix(filename):
-    return "." in filename and filename.rpartition(".")[-1] or ""
-
-
-def isnativemodule(module):
-    """isnativemodule(thing) → boolean predicate, True if `module`
-    is a native-compiled (“extension”) module.
-
-    Q.v. this fine StackOverflow answer on this subject:
-        https://stackoverflow.com/a/39304199/298171
-    """
-    # Step one: modules only beyond this point:
-    if not inspect.ismodule(module):  # pragma: no cover
-        return False
-
-    # Step two: return truly when “__loader__” is set:
-    if isinstance(
-        getattr(module, "__loader__", None), importlib.machinery.ExtensionFileLoader
-    ):  # pragma: no cover
-        return True
-
-    # Step three: in leu of either of those indicators,
-    # check the module path’s file suffix:
-    try:
-        ext = suffix(inspect.getfile(module))
-    except TypeError as exc:
-        return "is a built-in" in str(exc)
-
-    return ext in EXTENSION_SUFFIXES
-
 
 def turbo():
     # type: () -> bool
@@ -47,6 +13,7 @@ def turbo():
 
     modules = (cdc, minhash, simhash)
     for module in modules:
-        if not isnativemodule(module):
+        module_file = inspect.getfile(module)
+        if module_file.endswith(".py"):
             return False
     return True  # pragma: no cover

tests/test_check.py

@@ -1,16 +1,5 @@
 # -*- coding: utf-8 -*-
-from iscc_core import check
 import iscc_core as ic
-import array
-
-
-def test_check_suffix():
-    assert check.suffix("hello.world") == "world"
-
-
-def test_check_isnativemodule():
-    assert check.isnativemodule(check) is False
-    assert check.isnativemodule(array) is True
 
 
 def test_check_turbo(turbo):