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Kevin,
These are good points.
I had a cursory look at the python source code and observed the following:
- There may also be a concern with stderr (used to print the prompt in PyOS_Readline)
- PyOS_Readline has two different definitions in files pgenmain.c and myreadline.c
- There is this interesting comment in myreadline.c:
/* By initializing this function pointer, systems embedding Python can
 override the readline function.
 Note: Python expects in return a buffer allocated with PyMem_Malloc. */
char *(*PyOS_ReadlineFunctionPointer)(FILE *, FILE *, char *);
This pointer is actually used (set it to (void*)1 and the interpreter crashes) so it could offer a means to redirect stdin as we want. For stdout/stderr further investigation is needed.