How to make python script press 'enter' when prompted on Shell

Question

I want to automatize upgrade of a program.

I run in Python this code:

import subprocess
subprocess.call('./upgrade')

When I do this, I get output from shell that Upgrade procedure started successfully, and then I get 'Press Enter to continue'. How would I automatize this process, so that python script automatically "presses" enter when promted? I need this to be done twice during procedure. I need this to be done on Linux, not Windows, as it was asked here: Generate keyboard events Also, this needs to be done specifically after Shell prompts for Enter. Thanks for any help. I did not find solution here: Press enter as command input

possible duplicate of Press enter as command input

Holt
– Holt

2015-07-21 09:53:02 +00:00
Commented Jul 21, 2015 at 9:53 — Holt
– Holt, Commented Jul 21, 2015 at 9:53
Use the expect module

muddyfish
– muddyfish

2015-07-21 10:01:23 +00:00
Commented Jul 21, 2015 at 10:01 — muddyfish
– muddyfish, Commented Jul 21, 2015 at 10:01

Community · Accepted Answer · 2017-05-23 12:32:24Z

18

You can use subprocess.Popen and subprocess.communicate to send input to another program.

For example, to send "enter" key to the following program test_enter.py:

print "press enter..."
raw_input()
print "yay!"

You can do the following:

from subprocess import Popen, PIPE
p = Popen(['python test_enter.py'], stdin=PIPE, shell=True)
p.communicate(input='\n')

You may find answer to "how do i write to a python subprocess' stdin" helpful as well.

edited May 23, 2017 at 12:32

CommunityBot

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answered Jul 21, 2015 at 10:20

Julia Schwarz

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4 Comments

user136036 Over a year ago

Quote from the subprocess module (python 3) regarding input: if self.universal_newlines is True, this should be a string; if it is False, "input" should be bytes. So: input=b'\n'

Kevin Liu Over a year ago

comment this for myself and other people who maybe have met this problem. When I use Popen but not call, the communicate API will be blocked or timeout, and then according to the official doc, it said: Note that if you want to send data to the process’s stdin, you need to create the Popen object with stdin=PIPE after I add this in my code, it works.

Sterling Over a year ago

Argument "input" to "communicate" of "Popen" has incompatible type "str"; expected "Optional[bytes]"mypy(error) (just a warning)

luisito_36 Feb 20 at 17:07

Starting with Python 3, raw_input() was renamed to input(), besides print "" was replaced to print("") and add b before '\n'.

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