Error to render Inline PDF with CGI in Python 3.7 - apache

Question

When script is executed with python CGI PDF is feching well. But if i import script in another module unable to fetch pdf.
import cgi
form = cgi.FieldStorage()
import os,io,html,sys
from reportlab.pdfgen import canvas
from reportlab.lib.pagesizes import letter
data = 'Create a new PDF with Reportlab Swamy® RedteK 4104 DE* ≤ 0.4 ≤ 1.5 *'
packet = io.BytesIO()
can = canvas.Canvas(packet, pagesize=letter)
strdata = data.encode('utf-8','xmlcharrefreplace')
cat = str(html.unescape(strdata.decode()))
can.drawString(10, 500, cat)
can.showPage()
can.save()
packet.seek(0)
print('Content-type: application/pdf')
print('Content-Disposition: inline; filename="out.pdf"')
print('\n\n')
sys.stdout.flush()
sys.__stdout__.buffer.write(packet.getvalue())
PDF fetched when module when script is initiated directly.
Error when import in another module
Error in apache errorlogs: malformed header from script. Bad header=%PDF-1.3:
Thanks you,

Answer 1

A guess from a non-python guy here:
print('Content-type: application/pdf')
print('Content-Disposition: inline; filename="out.pdf"')
print('\n\n')
looks suspicious: A linebreak is required after each HTTP-header:
print('Content-type: application/pdf')
print('\n')
print('Content-Disposition: inline; filename="out.pdf"')
print('\n\n')
As you say you see "malformed header from script" in the logs: Monitor them. I assume that the version without an extra linebreak just has the Content-Type header with a really weird content type:
Content-type: application/pdfContent-Disposition: inline; filename="out.pdf"
while the browser (and server) could (and should) make use of
Content-type: application/pdf
Content-Disposition: inline; filename="out.pdf"