Issue #26667: Add path-like object support to importlib.util.

Doc/library/importlib.rst

@@ -1149,6 +1149,9 @@ an :term:`importer`.
       The *optimization* parameter was added and the *debug_override* parameter
       was deprecated.
 
+   .. versionchanged:: 3.6
+      Accepts a :term:`path-like object`.
+
 
 .. function:: source_from_cache(path)
 
@@ -1162,6 +1165,9 @@ an :term:`importer`.
 
    .. versionadded:: 3.4
 
+   .. versionchanged:: 3.6
+      Accepts a :term:`path-like object`.
+
 .. function:: decode_source(source_bytes)
 
    Decode the given bytes representing source code and return it as a string
@@ -1298,6 +1304,9 @@ an :term:`importer`.
 
    .. versionadded:: 3.4
 
+   .. versionchanged:: 3.6
+      Accepts a :term:`path-like object`.
+
 .. class:: LazyLoader(loader)
 
    A class which postpones the execution of the loader of a module until the

Doc/whatsnew/3.6.rst

@@ -68,8 +68,6 @@ New syntax features:
 
 Standard library improvements:
 
-* PEP 519: :ref:`Adding a file system path protocol <pep-519>`
-
 Security improvements:
 
 * On Linux, :func:`os.urandom` now blocks until the system urandom entropy pool
@@ -513,6 +511,11 @@ restriction that :class:`importlib.machinery.BuiltinImporter` and
 :class:`importlib.machinery.ExtensionFileLoader` couldn't be used with
 :class:`importlib.util.LazyLoader`.
 
+:func:`importlib.util.cache_from_source`,
+:func:`importlib.util.source_from_cache`, and
+:func:`importlib.util.spec_from_file_location` now accept a
+:term:`path-like object`.
+
 
 os
 --
@@ -528,6 +531,11 @@ The Linux ``getrandom()`` syscall (get random bytes) is now exposed as the new
 :func:`os.getrandom` function.
 (Contributed by Victor Stinner, part of the :pep:`524`)
 
+See the summary for :ref:`PEP 519 <pep-519>` for details on how the
+:mod:`os` and :mod:`os.path` modules now support
+:term:`path-like objects <path-like object>`.
+
+
 pickle
 ------
 

Lib/importlib/_bootstrap_external.py

@@ -279,6 +279,7 @@ def cache_from_source(path, debug_override=None, *, optimization=None):
             message = 'debug_override or optimization must be set to None'
             raise TypeError(message)
         optimization = '' if debug_override else 1
+    path = _os.fspath(path)
     head, tail = _path_split(path)
     base, sep, rest = tail.rpartition('.')
     tag = sys.implementation.cache_tag
@@ -309,6 +310,7 @@ def source_from_cache(path):
     """
     if sys.implementation.cache_tag is None:
         raise NotImplementedError('sys.implementation.cache_tag is None')
+    path = _os.fspath(path)
     head, pycache_filename = _path_split(path)
     head, pycache = _path_split(head)
     if pycache != _PYCACHE:
@@ -536,6 +538,8 @@ def spec_from_file_location(name, location=None, *, loader=None,
                 location = loader.get_filename(name)
             except ImportError:
                 pass
+    else:
+        location = _os.fspath(location)
 
     # If the location is on the filesystem, but doesn't actually exist,
     # we could return None here, indicating that the location is not

Lib/test/test_importlib/test_spec.py

@@ -5,6 +5,7 @@ machinery = test_util.import_importlib('importlib.machinery')
 util = test_util.import_importlib('importlib.util')
 
 import os.path
+import pathlib
 from test.support import CleanImport
 import unittest
 import sys
@@ -659,6 +660,11 @@ class FactoryTests:
         self.assertEqual(spec.cached, self.cached)
         self.assertTrue(spec.has_location)
 
+    def test_spec_from_file_location_path_like_arg(self):
+        spec = self.util.spec_from_file_location(self.name,
+                                                 pathlib.PurePath(self.path))
+        self.assertEqual(spec.origin, self.path)
+
     def test_spec_from_file_location_default_without_location(self):
         spec = self.util.spec_from_file_location(self.name)
 

Lib/test/test_importlib/test_util.py

@@ -5,6 +5,7 @@ machinery = util.import_importlib('importlib.machinery')
 importlib_util = util.import_importlib('importlib.util')
 
 import os
+import pathlib
 import string
 import sys
 from test import support
@@ -676,6 +677,15 @@ class PEP3147Tests:
             self.util.cache_from_source('\\foo\\bar\\baz/qux.py', optimization=''),
             '\\foo\\bar\\baz\\__pycache__\\qux.{}.pyc'.format(self.tag))
 
+    @unittest.skipUnless(sys.implementation.cache_tag is not None,
+                         'requires sys.implementation.cache_tag not be None')
+    def test_source_from_cache_path_like_arg(self):
+        path = pathlib.PurePath('foo', 'bar', 'baz', 'qux.py')
+        expect = os.path.join('foo', 'bar', 'baz', '__pycache__',
+                              'qux.{}.pyc'.format(self.tag))
+        self.assertEqual(self.util.cache_from_source(path, optimization=''),
+                         expect)
+
     @unittest.skipUnless(sys.implementation.cache_tag is not None,
                          'requires sys.implementation.cache_tag to not be '
                          'None')
@@ -738,6 +748,15 @@ class PEP3147Tests:
         with self.assertRaises(ValueError):
             self.util.source_from_cache(path)
 
+    @unittest.skipUnless(sys.implementation.cache_tag is not None,
+                         'requires sys.implementation.cache_tag to not be '
+                         'None')
+    def test_source_from_cache_path_like_arg(self):
+        path = pathlib.PurePath('foo', 'bar', 'baz', '__pycache__',
+                                'qux.{}.pyc'.format(self.tag))
+        expect = os.path.join('foo', 'bar', 'baz', 'qux.py')
+        self.assertEqual(self.util.source_from_cache(path), expect)
+
 
 (Frozen_PEP3147Tests,
  Source_PEP3147Tests

Misc/NEWS

@@ -108,6 +108,8 @@ Library
 
 - Issue #28005: Allow ImportErrors in encoding implementation to propagate.
 
+- Issue #26667: Support path-like objects in importlib.util.
+
 - Issue #27570: Avoid zero-length memcpy() etc calls with null source
   pointers in the "ctypes" and "array" modules.