[Python-checkins] r55749 - sandbox/trunk/import_in_py/pseudocode.py

[brett.cannon]

Author: brett.cannon
Date: Sun Jun  3 21:50:53 2007
New Revision: 55749

Added:
   sandbox/trunk/import_in_py/pseudocode.py   (contents, props changed)
Log:
Begin a file containing the pseudocode of how imports work.


Added: sandbox/trunk/import_in_py/pseudocode.py
==============================================================================
--- (empty file)
+++ sandbox/trunk/import_in_py/pseudocode.py	Sun Jun  3 21:50:53 2007
@@ -0,0 +1,21 @@
+"""Pseudocode to explain how importing works.
+
+Caveats:
+    + Classic relative import semantics are not currently covered.
+    + Assume all code runs with the import lock held.
+
+"""
+if level != 0:  # Relative import.
+    name = resolve_name(name, level)  # XXX
+# Import each parent in the name, starting at root.
+# Skipping over details of constructing each parent name and setting the proper
+# attribute on the parent for newly imported modules.
+for parent in name:
+    if parent in sys.modules:
+        continue
+    for meta_importer in sys.meta_path:
+        check_meta_path(parent, meta_importer)  # XXX
+    for path_entry in sys.path:
+        check_path(parent, path_entry)  # XXX
+    # XXX error: not found
+return module_to_return(path, fromlist)  # XXX