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class FeedbackForm(forms.Form):
    fullname = forms.CharField(max_length=100, required=True)
    phone = RUPhoneNumberField(required=False)
    email = forms.EmailField(required=True)
    feedback = forms.CharField(widget=forms.Textarea, required=True)

def feedback_and_suggestions(request):
    if request.method == 'POST':
        form = FeedbackForm(request.POST)
        name_ = request.POST.get('fullname')
        email_ = request.POST.get('email')
        phone_ = request.POST.get('phone')
        feedback_ = request.POST.get('feedback')
        error = ''
        if form.is_valid():
            feedback_row = Feedback(name=name_, email=email_, phone=phone_, feedback=feedback_)
            feedback_row.save()
            return HttpResponse('Спасибо!')
        else:
            if name_ == '':
                error += 'Имя обязательно.'
            else:
                if 'name' in form._errors:
                    error += 'Имя введено неверно.'
            if 'phone' in form._errors:
                error += '<br>Неправильный формат телефонного номера.'
            if email_ == '':
                error += '<br>E-mail обязателен.'
            else:
                if 'email' in form._errors:
                    error += '<br>E-mail введён неверно.'
            if feedback_ == '':
                error += '<br>Текст сообщения обязателен.'
            return HttpResponse(error)