def customer_has_card(obj):
    return obj.customer.card_fingerprint != ""
Pull the appropriate field data from the context to pass to the next wizard step
dataset/ETHPy150Open pydanny/dj-stripe/djstripe/admin.py/customer_has_card--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/contrib/formtools/tests/__init__.py/WizardTests.grab_field_data