Issue #18864: Add a setter for ModuleSpec.has_location.

Doc/library/importlib.rst

@@ -901,7 +901,7 @@ find and load modules.
 
    .. attribute:: has_location
 
-   (Read-only) Boolean indicating whether or not the module's "origin"
+   Boolean indicating whether or not the module's "origin"
    attribute refers to a loadable location.
 
 :mod:`importlib.util` -- Utility code for importers

Lib/importlib/_bootstrap.py

@@ -841,6 +841,10 @@ def parent(self):
     def has_location(self):
         return self._set_fileattr
 
+    @has_location.setter
+    def has_location(self, value):
+        self._set_fileattr = bool(value)
+
 
 def spec_from_loader(name, loader, *, origin=None, is_package=None):
     """Return a module spec based on various loader methods."""

Lib/test/test_importlib/test_spec.py

@@ -116,6 +116,13 @@ def test_default_is_package_true(self):
         self.assertIs(spec.cached, None)
         self.assertFalse(spec.has_location)
 
+    def test_has_location_setter(self):
+        spec = self.machinery.ModuleSpec(self.name, self.loader,
+                                         origin='somewhere')
+        self.assertFalse(spec.has_location)
+        spec.has_location = True
+        self.assertTrue(spec.has_location)
+
     def test_equality(self):
         other = type(sys.implementation)(name=self.name,
                                          loader=self.loader,

Misc/NEWS

@@ -105,6 +105,8 @@ Library
 - Issue #19698: Removed exec_module() methods from
   importlib.machinery.BuiltinImporter and ExtensionFileLoader.
 
+- Issue #18864: Added a setter for ModuleSpec.has_location.
+
 - Fixed _pickle.Unpickler to not fail when loading empty strings as
   persistent IDs.