Python return error while writing data into file(Python 2.7)

Question

I am parsing XML file with python mini-Dom module.while writing data into file its giving error like Unicode Encode Error: 'ASCII' codec can't encode characters in position 0-3: ordinal not in range(128). But Out put prints perfectly on command line Please tell me the solution.

my XML file is:

   <?xml version="1.0"?>
    <Feature>
        <Word Root  ="ਨੌਕਰ-ਚਾਕਰ">
            <info Inflection  ="ਨੌਕਰਾਂ-ਚਾਕਰਾਂ">
        <posinfo gender  ="Masculine" number  ="Plural" case  ="Oblique" />

                </info>
        </Word>
                </Feature>

My python code is:

import sys

from xml.dom import minidom

file=open("npu.txt","w+")
doc = minidom.parse("NPU.xml")
word = doc.getElementsByTagName("Word")
for each in word:
    # print "root"+each.getAttribute("Root")
    file.write(each.getAttribute("Root")+"\n")
    hh=each.getElementsByTagName("info")

    for each1 in hh:
        # print "inflection"+each1.getAttribute("Inflection")
        file.write(each1.getAttribute("Inflection")+"\t")

        vv=each1.getElementsByTagName("posinfo")
        for each2 in vv:
            # print each2.getAttribute("gender")
            # print each2.getAttribute("number")
            # print each2.getAttribute("case")
            file.write( each2.getAttribute("gender")+",")
            file.write( each2.getAttribute("number")+",")
            file.write(each2.getAttribute("case"))
        file.write("\n")
    file.write("--------\n")

Answer 1

encode data while writing-
#!/usr/bin/env python
# -*- coding: utf-8 -*-
file=open("npu.txt","w+") 
file.write("ਨੌਕਰ-ਚਾਕਰ")