Gah! Here’s sampe code that’s hit me a couple of times. So here’s a message for myself, the next time I bang my head on this error: :-)
Try leaving out the __contains__ function and you’ll see the error Key Error: 0, regardless of which key you try to extract from the item = Container(...) object.
class Container(object):
VALUE_CODE = "valueCode"
EXPIRY_DATE = "expiryDate"
VERIFICATION_URL = "verificationUrl"
item_attributes = "{} {} {}".format(VALUE_CODE, EXPIRY_DATE, VERIFICATION_URL)
def __init__(self, course_instance_data):
if isinstance(course_instance_data, Container):
self._data = course_instance_data._data
elif isinstance(course_instance_data, dict):
self._data = dict(course_instance_data)
else:
args = type(course_instance_data)
raise ValueError("Container constructor takes a Container or a dict, got {}".format(args))
def __contains__(self, item):
return item in self._data.keys()
def __getitem__(self, item):
return self._data[item]
def _strip_empty_fields(item):
result = {}
for key in Container.item_attributes.split():
if key in item:
value = item[key]
if value != "":
result[key] = value
return result
if __name__ == '__main__':
item = Container({"valueCode": "value", "expiryDate": ""})
print(_strip_empty_fields(item))