def _get_errors(self):
        if self._errors is None:
            self.full_clean()
        return self._errors
Go through the list of layers and fill in the missing bits of information.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/forms/forms.py/BaseForm._get_errors--crossover with--dataset/ETHPy150Open pydata/pandas/pandas/tools/rplot.py/sequence_layers