def backwards(self, orm):
        Permission.objects.filter(codename="project_perm.submit_translations"
            ).update(codename="project_perm.submit_file")
Accepts a matrix (an array of arrays, where each child array represents a row)
dataset/ETHPy150Open rvanlaar/easy-transifex/src/transifex/transifex/txpermissions/migrations/0001_submit_translations.py/Migration.backwards--crossover with--dataset/ETHPy150Open Miserlou/django-easy-split/easy_split/significance.py/chi_square_p_value