Django Error list object has no attribute get

-2
def insertcadastro(request):
if request.method == ''POST'':
    form = insertcadastroForm(request.POST)
    tk = insertcadastroForm(request.POST.getlist(''n_codpecadas''))
    if form.is_valid():
        tk.save()
        form.save()

    else:
        redirect(''/cadastrornc/'')
else:
    form = insertcadastroForm()
return render(request, ''home.html'', {''form'': form})



class insertcadastroForm(forms.ModelForm):
class Meta:
    model = insertcadastro
    fields = "__all__"


Segue abaixo meu models.py



class insertcadastro(models.Model):

c_statucadas = models.CharField(max_length=100)
n_rncsscadas = models.CharField(max_length=100)
n_codpecadas = models.CharField(max_length=100)

class Meta:
 db_table = "rnccadas"