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()
"""
    .replace('document.write', 'return '))
result = js2py.eval_js(js)
Выполнение Javascript из Python