Python: Strange behaviour from pexpect

veryangryman · 17-07-2020 04:54PM #1

I am using pexpect to check i am in the correct dir

    child = pexpect.spawn('ls')
    print(str(child.read()))
    child.expect("e")

However it says it cannot find it despite the output of child.read() print being

b"'~'   auto_copy_file.py   auto_upload_file.py   file   testout.txt\r\n"

Not sure what is wrong. Full error below

    Error
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pexpect/spawnbase.py", line 166, in read_nonblocking
    s = os.read(self.child_fd, size)
OSError: [Errno 5] Input/output error

Talisman · 17-07-2020 10:14PM

The dreaded "[Errno 5] Input/output error" :eek:

It has perplexed me at times and the solutions are never the same.

When pexpect.expect spits the dummy it's usually with an EOF or TIMEOUT exception.

The error message you are receiving suggests it's not the provided piece of code that is the cause of the issue, it's possibly in the OS or hardware level.

What version of Python 3 are you running and on what environment?

Python: Strange behaviour from pexpect

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