django - django - HTML to PDF in Indian languages with pisa

Question

I'm converting a HTML file into PDF in Django using Pisa. It is working when the content is only in English. But here the content will be in English and five other Indian languages(Tamil, Hindi, Telugu, Malayalam, and Kannada). I have given my code below.

views.py

def render_to_pdf1(template_src, context_dict):
    template = get_template(template_src)
    context  = Context(context_dict)
    html     = template.render(context)
    result   = StringIO.StringIO()
    pdf      = pisa.pisaDocument(StringIO.StringIO(html.encode('UTF-8')), result)
    return result.getvalue()

def print_pdf(request):
    message = Message.objects.get(id = 1)
    html_table_string = ''
    html_table_string += '%s' % message.english
    html_table_string += '%s' % message.tamil
    html_table_string += '%s' % message.hindi
    html_table_string += '%s' % message.telugu
    html_table_string += '%s' % message.kannada
    html_table_string += '%s' % message.malayalam

    fileread = str(settings.TEMPLATE_DIRS[0])+str('/base_file.html')
    fr = open(fileread, "r").read()
    fr = fr.replace('message_content', html_table_string)
    result = StringIO.StringIO()
    filewrite = str(settings.TEMPLATE_DIRS[0]) + str('/temp_file.html')
    empty = ""
    fw = open(filewrite, 'w')
    fw.write(empty)
    fw.write(fr)
    fw.close()
    pdf_contents     = render_to_pdf1('temp_file.html',result)
    file_to_be_saved = ContentFile(pdf_contents)
    name             = (str(request.user.email) + ".pdf").replace("@", '')
    pdf              = Pdf.objects.create(name = name, user = request.user, created_by = request.user)
    pdf.name.save(name ,file_to_be_saved)
    file_path = Pdf.objects.get(user = request.user).name
    pdf_file = str(file_path).split("media")[1]
    return HttpResponseRedirect('/site_media' + pdf_file)

Here what I'm doing is:

• Having a base template base_file.html.
• Getting the message object by ID (ID will be dynamically supplied).
• Then replacing the message_content with current content.
• Writing it in a file temp_file.html.
• Converting temp_file.html into a PDF file.

The converted PDF will be containing the message in English, Tamil, Hindi, Telugu, Kannada, and Malayalam. But I couldn't write the other language contents in the HTML file and couldn't convert it. The error I'm getting is 'ascii' codec can't encode characters in position 1066-1075: ordinal not in range(128) and occurs in the line fw.write(fr).

So how can I achieve this? I want to print the PDF file with content in all these languages.