Add a test that Py_IsInitialized() in Py_InitModule4(). See

gvanrossum · gvanrossum · commit 413407f103b5 · 2000-08-04T14:00:14.000Z
python-dev discussion.

This should catch future version incompatibilities on Windows.  Alas,
this doesn't help for 1.5 vs. 1.6; but it will help for 1.6 vs. 2.0.
diff --git a/Python/modsupport.c b/Python/modsupport.c
@@ -47,6 +47,8 @@ Py_InitModule4(char *name, PyMethodDef *methods, char *doc,
 {
 	PyObject *m, *d, *v;
 	PyMethodDef *ml;
+	if (!Py_IsInitialized())
+	    Py_FatalError("Interpreter not initialized (version mismatch?)");
 	if (module_api_version != PYTHON_API_VERSION)
 		fprintf(stderr, api_version_warning,
 			name, PYTHON_API_VERSION, name, module_api_version);

Original file line number	Diff line number	Diff line change
`@@ -47,6 +47,8 @@ Py_InitModule4(char name, PyMethodDef methods, char *doc,`
`47`	`47`	`{`
`48`	`48`	`PyObject m, d, *v;`
`49`	`49`	`PyMethodDef *ml;`
	`50`	`+ if (!Py_IsInitialized())`
	`51`	`+ Py_FatalError("Interpreter not initialized (version mismatch?)");`
`50`	`52`	`if (module_api_version != PYTHON_API_VERSION)`
`51`	`53`	`fprintf(stderr, api_version_warning,`
`52`	`54`	`name, PYTHON_API_VERSION, name, module_api_version);`