Try this:
>>> test_save = raw_input('[T]est [S]ave?: ')
[T]est [S]ave?: S
No answer is received, it hangs until you repeat typing the Enter key
(9 or more times). After that, raw-input behaves in another way:
>>> test_save = raw_input('[T]est [S]ave?: ')
[T]est [S]ave?: >>>
Value of test_save is:
>>> test_save
''
Regards.