Do not patch __loader__ if not available

sebastinas · sebastinas · commit afc28c3fb20a · 2020-09-06T10:45:33.000+02:00
diff --git a/bpython/curtsiesfrontend/repl.py b/bpython/curtsiesfrontend/repl.py
@@ -290,13 +290,14 @@ def find_distributions(self, context):
     def find_spec(self, fullname, path, target=None):
         for finder in self.old_meta_path:
             # Consider the finder only if it implements find_spec
-            if not getattr(finder, "find_spec", None):
+            if getattr(finder, "find_spec", None) is None:
                 continue
             # Attempt to find the spec
             spec = finder.find_spec(fullname, path, target)
             if spec is not None:
-                # Patch the loader to enable reloading
-                spec.__loader__ = ImportLoader(self.watcher, spec.__loader__)
+                if getattr(spec, "__loader__", None) is not None:
+                    # Patch the loader to enable reloading
+                    spec.__loader__ = ImportLoader(self.watcher, spec.__loader__)
                 return spec
 
     def find_module(self, fullname, path=None):
