Windows path 7 Error: End Of File

[damistry]

Sorry if the title isn't that useful.

Im using windows. I installed the gnuplot_kernel and tried to run plot sin(x) and I get the error
"Error: gnuplot not found"
In a python kernel running

from jupyter_client.kernelspec import KernelSpecManager
ksm = KernelSpecManager()
ksm.find_kernel_specs()

I get an output of

{'gnuplot': 'C:\\Users\\deves\\AppData\\Roaming\\jupyter\\kernels\\gnuplot',
 'python3': 'C:\\ProgramData\\Anaconda3\\share\\jupyter\\kernels\\python3'}

Looking at the kernel.json it gives the expected
{"argv": ["/usr/bin/python", "-m", "gnuplot_kernel", "-f", "{connection_file}"], "display_name": "gnuplot", "language": "gnuplot", "name": "gnuplot"}

If I copy gnuplot.exe to C:\WINDOWS\ then gnuplot is found but then I get an error of:

Error: End Of File (EOF).
<pexpect.popen_spawn.PopenSpawn object at 0x000001CC7CC52240>
searcher: searcher_re:
    0: re.compile('\\w*> $')
    1: re.compile('PEXPECT_PROMPT_')
    2: re.compile('PEXPECT_PROMPT+')

Any ideas on whats going on? If someone can give me a pointer on where to start then I'll give it a go at working out whats wrong too. Cheers!

[has2k1]

I cannot tell what is happening. Try this out from a python kernel.

import pexpect

spawn_cmd = 'path/to/gnuplot'
cmd = 'print "Testing"'
child = pexpect.spawn(spawn_cmd, encoding='utf-8')
child.sendline(cmd)
child.readline()
print(child.buffer) # result

It is a bare-bones test of the communication between python and gnuplot. i.e. gnuplot_kernel stripped to the bone.

[damistry]

Okay, I'll have to do some digging. Windows doesn't have pexpect.spawn() (https://pexpect.readthedocs.io/en/stable/overview.html#pexpect-on-windows).

I'll get back to you..

[has2k1]

Try this

from metakernel.pexpect import spawn

spawn_cmd = 'path/to/gnuplot'
cmd = 'print "Testing"'
child = spawn(spawn_cmd, encoding='utf-8')
child.sendline(cmd)
child.readline()
print(child.buffer) # result

[damistry]

Only an empty string comes back

[has2k1]

Can you go to the command prompt, start gnuplot and take a screen shot. Something like

I do not have access to a windows machine and I have not used gnuplot on windows. I want to confirm that the text and prompt are just about the same. Specifically, is the prompt gnuplot> , with the space after >?

[damistry]

Here you go. Yeah there is a space after the '>'