Problems with authenticate in Django 1.10

HI,

I'm trying to migrate an application from Django1.8.5/Python2.7 to Django 1.10/Python3.6 and having problems with code below:

def clean_password(self):
        username = self.cleaned_data.get('username')
        password = self.cleaned_data.get('password')
        user = authenticate(username=username, password=password)
        if user is None:
            raise forms.ValidationError(u'Senha incorreta.')

When I run in Django 1.8.5 it works fine, but when I run in Django 1.8.5 the authenticate command returns invalid password.

Can anybody help me?

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