bpo-34926: Make mimetypes.guess_type accept os.PathLike objects (GH-9777)

:meth:`mimetypes.MimeTypes.guess_type` now accepts :term:`path-like object` in addition to url strings.

Doc/library/mimetypes.rst

@@ -30,8 +30,10 @@ the information :func:`init` sets up.
 
    .. index:: pair: MIME; headers
 
-   Guess the type of a file based on its filename or URL, given by *url*.  The
-   return value is a tuple ``(type, encoding)`` where *type* is ``None`` if the
+   Guess the type of a file based on its filename, path or URL, given by *url*.
+   URL can be a string or a :term:`path-like object`.
+
+   The return value is a tuple ``(type, encoding)`` where *type* is ``None`` if the
    type can't be guessed (missing or unknown suffix) or a string of the form
    ``'type/subtype'``, usable for a MIME :mailheader:`content-type` header.
 
@@ -49,6 +51,9 @@ the information :func:`init` sets up.
    *strict* is ``False``, some additional non-standard but commonly used MIME types
    are also recognized.
 
+   .. versionchanged:: 3.8
+      Added support for url being a :term:`path-like object`.
+
 
 .. function:: guess_all_extensions(type, strict=True)
 

Lib/mimetypes.py

@@ -95,7 +95,7 @@ class MimeTypes:
             exts.append(ext)
 
     def guess_type(self, url, strict=True):
-        """Guess the type of a file based on its URL.
+        """Guess the type of a file which is either a URL or a path-like object.
 
         Return value is a tuple (type, encoding) where type is None if
         the type can't be guessed (no or unknown suffix) or a string
@@ -113,6 +113,7 @@ class MimeTypes:
         Optional `strict' argument when False adds a bunch of commonly found,
         but non-standard types.
         """
+        url = os.fspath(url)
         scheme, url = urllib.parse._splittype(url)
         if scheme == 'data':
             # syntax of data URLs:

Lib/test/test_mimetypes.py

@@ -1,6 +1,7 @@
 import io
 import locale
 import mimetypes
+import pathlib
 import sys
 import unittest
 
@@ -77,6 +78,29 @@ class MimeTypesTestCase(unittest.TestCase):
                                           strict=True)
         self.assertEqual(exts, ['.g3', '.g\xb3'])
 
+    def test_path_like_ob(self):
+        filename = "LICENSE.txt"
+        filepath = pathlib.Path(filename)
+        filepath_with_abs_dir = pathlib.Path('/dir/'+filename)
+        filepath_relative = pathlib.Path('../dir/'+filename)
+        path_dir = pathlib.Path('./')
+
+        expected = self.db.guess_type(filename)
+
+        self.assertEqual(self.db.guess_type(filepath), expected)
+        self.assertEqual(self.db.guess_type(
+            filepath_with_abs_dir), expected)
+        self.assertEqual(self.db.guess_type(filepath_relative), expected)
+        self.assertEqual(self.db.guess_type(path_dir), (None, None))
+
+    def test_keywords_args_api(self):
+        self.assertEqual(self.db.guess_type(
+            url="foo.html", strict=True), ("text/html", None))
+        self.assertEqual(self.db.guess_all_extensions(
+            type='image/jpg', strict=True), [])
+        self.assertEqual(self.db.guess_extension(
+            type='image/jpg', strict=False), '.jpg')
+
 
 @unittest.skipUnless(sys.platform.startswith("win"), "Windows only")
 class Win32MimeTypesTestCase(unittest.TestCase):

Misc/NEWS.d/next/Library/2018-10-10-00-22-57.bpo-34926.CA0rqd.rst

@@ -0,0 +1,2 @@
+:meth:`mimetypes.MimeTypes.guess_type` now accepts :term:`path-like object` in addition to url strings.
+Patch by Mayank Asthana.