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For other noobs like me: I was having trouble even using a class defined in another module of the _same_ package. This is what worked;

[catkin_ws_path]/src/my_package/src/my_package/__init__.py

[catkin_ws_path]/src/my_package/src/my_package/file_checker.py

[catkin_ws_path]/src/my_package/src/my_package/script_im_trying_to_run.py

• __init__.py is empty
• file_checker.py is the module; it contains a class called ConfigReader
• script_im_trying_to_run.py uses an instance of class ConfigReader

script_im_trying_to_run.py contains

....
import file_checker.py
....
....
an_instance = ConfigLoader('~/config.txt')
....

For other noobs like me: I was having trouble even using a class defined in another module of the _same_ package. This is what worked;

[catkin_ws_path]/src/my_package/src/my_package/\__init__.py

[catkin_ws_path]/src/my_package/src/my_package/file_checker.py  
[catkin_ws_path]/src/my_package/src/my_package/file_checker.py 
 
[catkin_ws_path]/src/my_package/src/my_package/script_im_trying_to_run.py [catkin_ws_path]/src/my_package/src/my_package/script_im_trying_to_run.py

• __init__.py is empty
• file_checker.py is the module; it contains a class called ConfigReader
• script_im_trying_to_run.py uses an instance of class ConfigReader

script_im_trying_to_run.py contains

....
import file_checker.py
....
....
an_instance = ConfigLoader('~/config.txt')
....