def is_valid(self):
        return self.is_bound and not bool(self.errors)
Get min/max value
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/forms/forms.py/BaseForm.is_valid--crossover with--dataset/ETHPy150Open kleientertainment/ds_mod_tools/pkg/win32/Python27/Lib/site-packages/PIL/Image.py/Image.getextrema