Pexpect timesout before executing whole output

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Pexpect timesout before executing whole output - eagerissac - Jun-23-2021

I'm new to python and pexpect and I'm writing a script that sends a bunch of commands to a board and prints the output of each command on my terminal.

When sending one of my commands in particular, I get some pexpect.expectations.TIMEOUT: Timeout exceeded error. It prints the output of half of my command (it's supposed to take 30-40 seconds to print the other half) but I get a timeout error before the terminal is able to print the 2nd half. I noticed this is fixed by adding a sleep(40) line above the child.expect(prompt) part, but is there a way to replace the sleep line with something else?

I have other commands that take time to print its entire output which also causes timeout errors, and adding so many sleep lines in my code makes my script take a really long time to finish running.

Example of my output:

    ->some command
    output
    output
    output
    output 
    waiting for something....

    #after 30-40 secs

    output
    output
    output
    output
    Execution completed successfully

What the part of my code looks like:

    child.sendline("some command")
    sleep(40)
    child.expect(prompt)

I'm not sure if there's something to replace the sleep() line where I can make it wait a minimum amount of time before timing out. From searching online, I tried replacing sleep() with:

child.expect(prompt, timeout = 60)

but that didn't seem to work as it causes the same timeout error. I'm not sure if I'm filling the first parameter correctly or if I'm even using the timeout method right. The prompt basically just prints '->' and the command is basically a test in itself which is why the output takes some time to finish loading. If I were to delete the sleep(40) line, my program throws a runtime error at child.expect(prompt) where the timeout is exceeded before the output can even finish loading.

With sleep(40), it outputs fine but I want something to replace that as having so many sleep() lines makes my program take a really long time to load.

I'm also using linux and writing my code in vim/a debian terminal.