I am writing a script in which in the external system command may sometimes
require user input. I am not able to handle that properly. I have tried using
os.popen4 and subprocess module but could not achieve the desired behavior.
Below mentioned example would show this problem using "cp" command. ("cp"
command is used to show this problem, i am calling some different exe which may
similarly prompt for user response in some scenarios). In this example there
are two files present on disk and when user tries to copy file1 to file2, an
conformer message comes up.
proc = subprocess.Popen("cp -i a.txt b.txt", shell=True, stdin=subprocess.PIPE,
stdout=subprocess.PIPE, stderr=subprocess.STDOUT,) stdout_val, stderr_val =
proc.communicate() print stdout_val b.txt?
proc.communicate("y")
Now in this example if i read only stdout/stderr and prints it, later on if i
try to write "y" or "n" based on user's input, i got an error that channel is
closed. Can some one please help me on achieving this behavior in python such
that i can print stdout first, then should take user input and write stdin
later on.
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