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How to fix 'name error' in a html form written in python

on

I get this error:

Traceback (most recent call last):
 File "/var/www/people/cosimo.matichecchia/html/analisi.py", line 66, in <module>
    </html>''' % (basia, basit, basig, basic, basin)
NameError: name 'basia' is not defined

I tried to use the function "import" but I get error 500 by the server. This is one of the first times I try to code in python, so there may be other errors in my code. If so, please tell me!!

#!/usr/bin/python
# -*- coding: utf-8 -*-
import cgi
import cgitb

cgitb.enable()

print "Content-Type: text/html" 

print

form = cgi.FieldStorage()

archivio={'Canis familiaris':'/home/web/fpoggi/data/Canis.fa' , 'Gallus gallus':'/home/web/fpoggi/data/Gallus.fa' , 'Gorilla gorilla':'/home/web/fpoggi/data/Gorilla.fa' , 'Homo sapiens':'/home/web/fpoggi/data/Homo.fa' , 'Ornithorhynchus anatinus':'/home/web/fpoggi/data/Ornithorhynchus.fa' , 'Rattus norvegicus': '/home/web/fpoggi/data/Rattus.fa'}
try:

    porzione=str(form["sequenza"].value)
    operazio=str(form["operazione"].value)

    if operazio=="operazione1":
        conta=dict()
        testo=open(archivio[porzione], "r")
        next(testo)
        basia=0
        basit=0
        basic=0
        basig=0
        basin=0
        conta['A']=0
        conta['T']=0
        conta['C']=0
        conta['G']=0
        conta['N']=0
        for riga in testo:
            for char in riga:  
                if char in conta:
                    conta[char]=(conta[char] + 1)
                else:
                    conta[char] = 1
        basia=((100.0*conta['A'])) / (conta['A']+conta['T']+conta['C']+conta['G']+conta['N'])
        basit=((100.0*conta['T'])) / (conta['A']+conta['T']+conta['C']+conta['G']+conta['N'])
        basig=((100.0*conta['G'])) / (conta['A']+conta['T']+conta['C']+conta['G']+conta['N'])
        basic=((100.0*conta['C'])) / (conta['A']+conta['T']+conta['C']+conta['G']+conta['N'])
        basin=((100.0*conta['N'])) / (conta['A']+conta['T']+conta['C']+conta['G']+conta['N'])
except:
    print '<html><head><meta charset="UTF-8"></head><body><h1>Messaggio di Errore</h1><p>Errore generico. Si prega di riprovare.</p></body></html>'

    print '''<html>
            <head>
                <title>Calcolo basi dna</title>
            </head>
            <body>
                <h2>Risultato: </h2>
                <p>La frequenza di A è:</p>
                <p>%g</p> 
                <p>La frequenza di T è:</p>
                <p>%g</p>
                <p>La frequenza di G è:</p>
                <p>%g</p> 
                <p>La frequenza di C è:</p>
                <p>%g</p>
                <p>La frequenza di N è:</p>
                <p>%g</p>
                <p> Torna a <a href="index.html">home</a></p>
            </body>
            </html>''' % (basia, basit, basig, basic, basin)

I expect the code to generate an HTML page with the results I want, but I get an HTML page with the print I wrote indented under the except and with this:

Traceback (most recent call last):
  File "/var/www/people/cosimo.matichecchia/html/analisi.py", line 66, in <module>
    </html>''' % (basia, basit, basig, basic, basin)
NameError: name 'basia' is not defined

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