如何使用 subprocess.Popen 将参数从 Python 传递给 R 脚本

Question

I'd like to pass a single variable to my R script while running it from python.

This is my code -

i = 0 

with open(result_filename, 'a') as result:
    process = subprocess.Popen(['Rscript',
                                'MyScript.R'
                                ],
                                stdout=result);

Here's a reproducible R example

#! /usr/bin/Rscript

print(i)
print(3)

How can I access i from my R Script?

Answer 1

You can look at the subprocess library in Python

You must pass the argument as a string. Then you can convert it back in your R script

Python :

import subprocess
    
i = 0 
with open(result_filename, 'a') as result: 
    output = subprocess.run(['Rscript', 'RScriptWeeklyActives.R', str(i)], stdout=result)

R :

#! /usr/bin/Rscript
args = commandArgs(trailingOnly=TRUE)
i = strtoi(args[1])
print(i)
print(3)

Answer 2

Use Subprocess

import subprocess

i = 0 

with open(result_filename, 'a') as result:
    command = subprocess.Popen(['Rscript', 'RScriptWeeklyActives.R', 'i'], stdout=result)

Rscript will get value 0 as a string you have to convert it to int.