Raw_input with readline in a daemon thread makes terminal text disappear
research at johnohagan.com
Fri Oct 16 02:57:45 CEST 2009
I'm getting input for a program while it's running by using raw_input in a
loop in separate thread. This works except for the inconvenience of not having
a command history or the use of backspace etc.
That can be solved by loading the readline module; however, it results in a
loss of visible access to the terminal when the program ends: nothing is
echoed to the screen and the history is invisible (although it is there -
hitting return executes whatever should be there normally). The only way to
get it back is to close the terminal and open a new one.
Here is minimal code that reproduces the problem (python 2.5 on Linux):
from threading import Thread
get_input = Thread(target=raw_input)
If the thread is not set to daemon mode, there is no such problem (don't know
why this makes a difference), but in the real program, it needs to be a daemon
or it hangs the exit waiting for more input.
Any suggestions appreciated.
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