No module named custom_module

[roger-yu-ds]

I'm trying to import the ExpectColumnMaxToBeBetweenCustom Expectation from this tutorial, but No module named 'custom_module'.

I have copied the file from Complete Example into the great_expectations/plugins directory.

For the suggested line from custom_module import ExpectColumnMaxToBeBetweenCustom to work there are few more steps required:

1. The column_custom_max_expectation.py file should be in great_expectations/plugins/custom_module instead of great_expectations/plugins
2. In great_expectations/plugins/custom_module, there should be an __init__.py file
3. In the __init__.py file there should be the line from .column_custom_max_expectation import ExpectColumnMaxToBeBetweenCustom