Link to download a file

Hi guys, I need some help to insert a link to download a file. In a view I read data from a csv file and I show them in a table in a template. Under the table I need to insert, when there are data, 

a link similar as Download data and when user click it, he download the datafile, previously I wrote the same data in a csv file. You can see a part of interested view and the template to show data. 

In the code doesn't download anything.

views.py 

listafile = os.listdir('static/dati')

        fileok=[]

        context={}

        i=0

        for file in listafile:

            inizio=str(file[0:4]).strip()

            if inizio==anno:   

                fileok.append(file)

            elif inizio=='coun':

                contaf=str(file[6:10]).strip()

                if contaf==anno:

                    fileok.append(file)

            else:

                pass #print "File NON trovato", inizio, anno

        

        for nomefile in fileok:

            nomedato=str(nomefile[5:-4]).strip()

            if nomedato==tipodati:

                path2file=str(("static/dati/"+str(nomefile)).strip())

                with open(path2file) as f:

                    for line in f:

                        riga = line.split(";")

                        if riga[0]==cciaa:

                            context[i]=line

                            i=i+1

        #print "context", context

        d2 = {  k:v.split(";") for k,v in context.items() }

        j=0

        datilist={} 

        field_names = ['Provincia CCIAA', 'Data Ora', 'Numero REA', 'Forma Giuridica', 'Count dati']

        f=open('static/tmp/dati.csv', 'w') 

        writer = csv.writer(f) #questa definisce la variabile writer usata x scrivere i dati nel file csv!!!

        writer.writerow(field_names)

        while j<len(d2):

            datilist[j]=[d2[j][0], d2[j][3], d2[j][5], d2[j][7], d2[j][10].rstrip(), ''] #

            writer.writerow(datilist[j])

            j=j+1      

        

        return render_to_response('showdata.html', context_instance=RequestContext(request, {'dictdati': datilist} )) 

    

    else:

        return render_to_response('home.html', context_instance=RequestContext(request, {'var': d} ))

def showdata(request):

    return render_to_response('showdata.html', context_instance=RequestContext(request, context))

showdata.html

<div class="container">

        <div class="jumbotron">

        <h1>Statistiche Dkey</h1>

        <p>Ecco in forma tabellare i dati richiesti..</p>

  

        <form method="post" action="/getdata/">

            <style>

              table { width: 90%; background-color: #FFFFFF; color: #000000; }

              th, td { width: 4%; }

            </style>

    

              <table border="0" cellspacing="0" cellpadding="0" align="center">

                <thead>

                <tr>

                  <th>Nome</th>

                  <th>Data_Ora</th>

                  <th>Numero</th>

                  <th>Forma</th>

                  <th>Count</th>

                         

                </tr>

                </thead>

                <tbody>

                 

                <tr> 

                      

                  {% for key, item in dictdati.items %}   

                     

                      {% for idx in item %} 

                        {% if idx != '' %}                     

                          <td>{{ idx }}</td>

                        {% else %}

                        <tr><td></td></tr>

                        {% endif %}

                      {% endfor %}  

                 

                  {% endfor %}    

                <tr>

                </tbody>

              </table>

        </form>

        <p><a href="{{ MEDIA_URL }}/dati.csv">Download dei dati</a><p>

        </div>

    </div> <!-- /container -->

Can someone give me some suggestion? Other posts didn't aided me. 

Thanks.

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