On Wed, Sep 17, 2008 at 9:14 PM, Hans Dushanthakumar < [EMAIL PROTECTED]> wrote:
> G'day everyone. > > I'm experimenting with a custom console application, and trying to add > command history functionality to it. It seems to basically work ok except > for the fact that when I press the Up arrow key to run previous commands, > the right commands are not displayed. It displays a wierd "^[[A" for each Up > arrow key that I press. Inspite of this, when I hit enter, it DOES seem to > run the right command. > > Heres a bit of code (stripped down to the bare essentials to demonstrate > just this problem) that shows this behaviour: > > ------X Code starts here > > import readline > import select > import sys > import os > > historyPath = ".pyhistory.test" > > if os.path.exists(historyPath): > readline.read_history_file(historyPath) > > inputs = [sys.stdin] #More on this later. > > while 1: > in_ready, out_ready, ex_ready = select.select(inputs, [], [], 10) #More > on this later. > x= raw_input() > print "You entered: ", x > > ----X End of code > > Heres what an example run of the program looks like, with my comments: > > [EMAIL PROTECTED]:~/tools$ python test_history1.py > ls <--------------------------------------Me: I entered "ls" here. So, this > is the 1st command. > ls > You entered: ls > 1 <---------------------------------------Me: 2nd command "1" > 1 > You entered: 1 > 2 <---------------------------------------Me: 3rd command "2" > 2 > You entered: 2 > ^[[A^[[A <--------------------------Me: This is the strange characters. I > pressed the Up key twice here. > 1 > You entered: 1 <----------------Me: So it looks like it received the right > command from history :"1". > > > So, my question is, why does it not display the right command from history > instead of those "^[[A" characters? > > It works fine if I comment out the line "in_ready, out_ready, ex_ready = > select.select(inputs, [], [], 10)". But there is a reason why I need this to > be there..I'm expecting input from more sources than just the keyboard. As far as I know... ^[[A is a control character; in this case it refers to the up-arrow keypress. I'm not sure what the select module docs mention, but I'd bet your answer is there. HTH, Wayne
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