commit 133138a284be1985ebd9ec9014f1306b9a425d98
author Serhiy Storchaka <storchaka@gmail.com> Tue Aug 02 22:51:21 2016 +0300
committer Serhiy Storchaka <storchaka@gmail.com> Tue Aug 02 22:51:21 2016 +0300
tree 15d5ad35ad76c65f88cb739100ff152194e96ef8
parent cde03fa0381fcb7f7d3ba0dff4e784eade1f3031

Issue #22557: Now importing already imported modules is up to 2.5 times faster.

Python/pylifecycle.c

diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index 2d2dcba..dc85551 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -254,6 +254,11 @@
     interp->importlib = importlib;
     Py_INCREF(interp->importlib);
 
+    interp->import_func = PyDict_GetItemString(interp->builtins, "__import__");
+    if (interp->import_func == NULL)
+        Py_FatalError("Py_Initialize: __import__ not found");
+    Py_INCREF(interp->import_func);
+
     /* Import the _imp module */
     impmod = PyInit_imp();
     if (impmod == NULL) {