Not able to read the text using pexpect/expect

[Bipinjohnson]

Hi,
I am new to python i am trying some automation where in i want to call a terminal application from python and control the same.
I have tried Pexpect where i am able to open the application, but not able to read the contents from the terminal.
pasted below is my code:

import pexpect

child = pexpect.spawn ('./test_app -g',timeout=3,encoding='utf-8')
#i am expecting the below string
return_val=child.expect(['Enable QSE API? (Y/n)'])
#if i receive the same string then i want to pass y to the terminal
child.sendline('y')

#now i am expecting the below string
child.expect('Enable log? (Y/n)')
child.sendline("y")

When i execute the above script always timeout occurs and gets the below erorr/log message:

Error:
user@user-laptop:~/Automation$ python3 script_v1.py 
Traceback (most recent call last):
  File "script_v1.py", line 5, in <module>
    return_val=child.expect(['Enable QSE API? (Y/n)'])
  File "/usr/local/lib/python3.6/site-packages/pexpect/spawnbase.py", line 344, in expect
    timeout, searchwindowsize, async_)
  File "/usr/local/lib/python3.6/site-packages/pexpect/spawnbase.py", line 372, in expect_list
    return exp.expect_loop(timeout)
  File "/usr/local/lib/python3.6/site-packages/pexpect/expect.py", line 181, in expect_loop
    return self.timeout(e)
  File "/usr/local/lib/python3.6/site-packages/pexpect/expect.py", line 144, in timeout
    raise exc
pexpect.exceptions.TIMEOUT: Timeout exceeded.
<pexpect.pty_spawn.spawn object at 0x7fae358ece10>
command: ./test_app
args: [b'./test_app', b'-g']
buffer (last 100 chars): '\x1b[2J\x1b[1dEnable QSE API? (Y/n) '
before (last 100 chars): '\x1b[2J\x1b[1dEnable QSE API? (Y/n) '
after: <class 'pexpect.exceptions.TIMEOUT'>
match: None
match_index: None
exitstatus: None
flag_eof: False
pid: 7737
child_fd: 5
closed: False
timeout: 3
delimiter: <class 'pexpect.exceptions.EOF'>
logfile: None
logfile_read: None
logfile_send: None
maxread: 2000
ignorecase: False
searchwindowsize: None
delaybeforesend: 0.05
delayafterclose: 0.1
delayafterterminate: 0.1
searcher: searcher_re:
    0: re.compile('Enable QSE API? (Y/n)')
user@user-laptop:~/Automation$

Something about the application: It runs on Ubuntu 18.x.x. terminal, once its started it will publish a menu and the user have to input the menu options.
Note: When i am tying to run the application manually, everything works fine.


Looking forward for some guidance from experts.


Regards
Johnson

Larz60+ write Jan-06-2022, 11:04 PM:
Please post all code, output and errors (it it's entirety) between their respective tags. Refer to BBCode help topic on how to post. Use the "Preview Post" button to make sure the code is presented as you expect before hitting the "Post Reply/Thread" button.
Fixed for you this time. Please use bbcode tags on future posts.