CODEWITHSUNDEEP
pythonpexpect
Ronu
Ronu

Reputation: 563

Why Python pexpect does not match the expected prompt with newline here

I am trying to execute client.py from run.py. The client.py prompts for an input. I have written a simple pexpect code but it doesn't match the prompt and hangs.

Here is my code

client.py

input = raw_input("Please data, default [ /Anything ]:\n")
if input == "Admin":
    print "Welcome Admin"
else:
    print "Welcom Guest"

run.py

import pexpect
child = pexpect.spawn ('python client.py')
child.expect('Please data, default [ /Anything ]:\n')
child.sendline ('anonymous')

Here is an another try with expect_exact, it did not help me..

run1.py

import pexpect
child = pexpect.spawn ('python client.py')
child.expect_exact('Please data, default [ /Anything ]:\n')
child.sendline ('anonymous')

Python and pexpect versions -

Python 2.7.2 (default, May 13 2014, 12:53:14)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pexpect
>>> pexpect.__version__
'3.2'
>>>

Upvotes: 4

Views: 8848

Answers (3)

SKT
SKT

Reputation: 174

You can just have Anything in pexpect and then proceed with your code.

child.pexpect('Anything')

Upvotes: 0

ojs
ojs

Reputation: 502

The problem is your \n character. As explained here. You are sending a \n but pexpect sees that as a \r\n, so you have to tell run.py to expect \r\n instead of just \n:

import pexpect
child = pexpect.spawn ('python client.py')
child.expect_exact('Please data, default [ /Anything ]:\r\n')
child.sendline ('anonymous')

Leave the client.py just as it is (do not add \r to the raw_input string there).

Upvotes: 2

Daniel
Daniel

Reputation: 42758

You may want to use expect_exact instead of expect, because the later method expects an regular expression, where [ is a special character.

Upvotes: 4

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