This is still an issue in js2py and this link may help you. https://github.com/PiotrDabkowski/Js2Py/issues/123#issuecomment-866218046

The only way to solve this is to modify translated file.

# translate myfunction.js, numar.js files to python
import js2py

js2py.translate_file('numar.js', 'numar.py')
js2py.translate_file('myfunction.js', 'myfunction.py')

// myfunction.js
var numar = require("./numar");
function myfunction() {
  var b = numar();
  return b;
}

// numar.js
function numar(){
    return 1; //return 1 if the checkbox is
}

# then modify translated myfunction.py file like this
__all__ = ['myfunction']

# Don't look below, you will not understand this Python code :) I don't.

from js2py.pyjs import *
from numar import numar
# setting scope
var = Scope( JS_BUILTINS )
set_global_object(var)

# Code follows:
var.registers(['numar', 'myfunction'])
@Js
def PyJsHoisted_myfunction_(this, arguments, var=var):
    var = Scope({'this':this, 'arguments':arguments}, var)
    var.registers(['b'])
    var.put('b', var.get('numar')())
    return var.get('b')
PyJsHoisted_myfunction_.func_name = 'myfunction'
var.put('myfunction', PyJsHoisted_myfunction_)
var.put('numar', numar.numar)
pass
pass


# Add lib to the module scope
myfunction = var.to_python()

# import in your code
from myfunction import myfunction

print(myfunction.myfunction())

You can find the code here.

https://github.com/lacmansoftware/python-js2py-require-solution

To interact with JavaScript from Python I use webkit, which is the browser renderer behind Chrome and Safari. There are Python bindings to webkit through Qt. In particular there is a function for executing JavaScript called evaluateJavaScript().

Here is a full example to execute JavaScript and extract the final HTML.

Using PyV8, I can do this. However, I have to replace document.write with return because there's no DOM and therefore no document.

import PyV8
ctx = PyV8.JSContext()
ctx.enter()

js = """
function escramble_758(){
var a,b,c
a='+1 '
b='84-'
a+='425-'
b+='7450'
c='9'
document.write(a+c+b)
}
escramble_758()
"""

print ctx.eval(js.replace("document.write", "return "))

Or you could create a mock document object

class MockDocument(object):

    def __init__(self):
        self.value = ''

    def write(self, *args):
        self.value += ''.join(str(i) for i in args)


class Global(PyV8.JSClass):
    def __init__(self):
        self.document = MockDocument()

scope = Global()
ctx = PyV8.JSContext(scope)
ctx.enter()
ctx.eval(js)
print scope.document.value

PyExecJS seems to be a good option.

>>> import execjs
>>> execjs.eval("'red yellow blue'.split(' ')")
['red', 'yellow', 'blue']
>>> ctx = execjs.compile("""
...     function add(x, y) {
...         return x + y;
...     }
... """)
>>> ctx.call("add", 1, 2)
3

to install:

$ pip install PyExecJS