Pass named arguments to python script through python-shell on node.js without quotes

Question

I am calling a python script using PythonShell through this code :

let python_options = {
    mode: "text",
    pythonPath: "python",
    scriptPath:"./python/",
    args: ["-fil '"+file_path+"'"]
};
let pyshell = new PythonShell.PythonShell('my_script.py',python_options);
pyshell.on('message', function(message) {
    console.log(message);
});
pyshell.end( function(err,code,signal) {
    if (err) console.log("Error %j", err);
    console.log('The exit code was: ' + code);
    console.log('The exit signal was: ' + signal);

    // console.log("results: %j", results);
    res.send(code);
});

then within my Python script I do

import argparse
parser = argparse.ArgumentParser(formatter_class=argparse.RawTextHelpFormatter)
parser.add_argument("-fil", '--file', required=False, default=None)

The error message I'm getting when calling the script is

my_script.py: error: unrecognized arguments: -fil 'path_to_the_file'

My issue is that the shell passes "-fil path_to_the_file" to the CLI, which gets interpreted as one argument by argparse, instead of -fil path_to_the_file which would be correctly interpreted by argparse.

How can I remove the quotes in PythonShell ?

have you tried passing it a list with multiple args instead of a list with a string representing all the args? e.g. args: ["-fil", file_path] — E.Serra
– E.Serra, Commented Mar 18, 2019 at 10:30
I'm getting the same error unfortunately. When I try myself in the CLI it works even with the quotes though so I'm less confident in my diagnostic now... — Chapo
– Chapo, Commented Mar 18, 2019 at 10:36
"-fil " "paht_to_the_file" works in the CLI in case my comment above was unclear. But the PythonShell call still fails with the same error message. — Chapo
– Chapo, Commented Mar 18, 2019 at 10:37
try --file instead of fil, let me know what happens, I think your python code is the one that is wrong. Are you sure if you say python my_script.py "-fil " "paht_to_the_file" works? Python should not understand an arg with quotes AFAIK it will take it as a postional arg not as a keyword — E.Serra
– E.Serra, Commented Mar 18, 2019 at 10:42
I actually modified my code after I asked the question to remove the shortcuts from the argparse instance. So I'm calling it with --file already and yes it works in the CLI only. pyhton 3.7 on windows — Chapo
– Chapo, Commented Mar 18, 2019 at 10:46

Chapo · Accepted Answer · 2019-03-18 23:19:13Z

2

In case it can help anyone, the solution is to do :

let python_options = {
    mode: "text",
    pythonPath: "python",
    scriptPath:"./python/",
    args: ["-fil",file_path] // instead of args: ["-fil '"+file_path+"'"]
};

answered Mar 18, 2019 at 23:19

Chapo

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