How can I execute JavaScript code from Python?

Question

Lets say that I have this code inside a JavaScript file:

var x = 10; x = 10 - 5; console.log(x); function greet() { console.log("Hello World!"); } greet() 

How would I use Python to execute this code and "print"x and Hello World!?
Here is some pseudo code that further explains what I'm thinking:

# 1. open the script script = open("/path/to/js/files.js", "r") # 2. get the script content script_content = script.read() # 3. close the script file script.close() # 4. execute the script content and "print" "x" and "Hello World!" x = js.exec(script_content) 

And, the expected result would look like this:

>>> 5 >>> "Hello World!" 

Answer 1

The module Naked does exactly this. pip install Naked (or install from source if you prefer) and import the library shell functions as follows:

from Naked.toolshed.shell import execute_js, muterun_js response = muterun_js('file.js') if response.exitcode == 0: print(response.stdout) else: sys.stderr.write(response.stderr) 

For your particular case, with file.js as

var x = 10; x = 10 - 5; console.log(x); function greet() { console.log("Hello World!"); } greet() 

the output is '5\nHello World!\n', which you can parse as desired.