django-orchestra-test/orchestra/apps/resources/validators.py

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from django.core.validators import ValidationError
from django.utils.translation import ugettext_lazy as _
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def validate_scale(value):
try:
int(eval(value))
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except Exception as e:
raise ValidationError(
_("'%s' is not a valid scale expression. (%s)") % (value, str(e))
)