DataContext, BaseDataContext, DataContextConfig, and get_checkpoint()

[williamBartos]

The documentation outlines a way to dynamically generate a data context. I'm planning on running this from the script created from the checkpoint script cli call.

However there's a few issues:

1. DataContextConfig can only be used to instantiate BaseDataContext and not DataContext. The DataContextConfig is passed in via the project_config arg.
2. BaseDataContext doesnt have a get_checkpoint() method. So I can't use it in place of DataContext.

__init__ of BaseDataContext: https://github.com/great-expectations/great_expectations/blob/develop/great_expectations/data_context/data_context.py#L224
__init__ of DataContext: https://github.com/great-expectations/great_expectations/blob/develop/great_expectations/data_context/data_context.py#L2245

If I'm understanding correctly, this means that I'm unable to create a DataContextConfig dynamically and use it in a Checkpoint. This is because DataContext seems to only accept a yaml file as a config and not a DataContextConfig.

Describe the solution you'd like

DataContext should be able to be instantiated with a DataContextConfig, either through a project_config arg like BaseDataContext or through some other method.

[eugmandel]

Replied on this in https://discuss.greatexpectations.io/t/datacontext-basedatacontext-datacontextconfig-and-get-checkpoint/315/2 - since the workaround exists, closing the issue.