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from django.forms import CharField
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from django.core.exceptions import ValidationError
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from django.utils.translation import ugettext_lazy as _
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from django.core.validators import EMPTY_VALUES
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class DigitField(CharField):
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def clean(self, value):
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super(DigitField, self).clean(value)
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if value not in EMPTY_VALUES and not value.isdigit():
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raise ValidationError(_('Please enter only digits.'))
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return value
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