Method to_python

django/contrib/auth/forms.py:60–69

(self, value)

class UsernameField(forms.CharField):
    def to_python(self, value):
        value = super().to_python(value)
        if self.max_length is not None and len(value) > self.max_length:
            # Normalization can increase the string length (e.g.
            # "ff" -> "ff", "½" -> "1⁄2") but cannot reduce it, so there is no
            # point in normalizing invalid data. Moreover, Unicode
            # normalization is very slow on Windows and can be a DoS attack
            # vector.
            return value
        return unicodedata.normalize("NFKC", value)

    def widget_attrs(self, widget):
        return {