Django : lecture csv file apres upload échoué

def Savedocument(request):
uploadFailed='Your upload is failed, the format of file must be a csv file, 
Please try again'

docfile = request.FILES["docfile"]
if not docfile.name.endswith('.csv'):
    messages.error(request,'File is not CSV type')
    return render(request,'app/modelisation.html',{'uploadFailed':uploadFailed})

if request.method == 'POST':
    form = DocumentForm(request.POST, request.FILES)
    if form.is_valid():
        form.save()
        listApp=[]
        paramFile = request.FILES['docfile'].read()
        data = csv.DictReader(paramFile)
        for row in data:
            listApp.append(row)

        return render(request,'app/modelisation.html',{'listApp':listApp})
return render(request,'app/modelisation.html')