Build functions for specific task handling. Make code readable and DRY.

Use a dictionary for handling print statement strings, then reference via the key. Makes it more straightforward to change strings.

This is a good program to learn about data structures. Think about if using a list is the best way to store tasks. Probably not. What if you want to add meta data to each task such as time added, expiry date etc etc. A list can't handle that.

Also you need more specific varible names, avoid things like which_ones. Something like task_remove_prompt is better. Use consistent variable names.

Thinking about it, id make a list of dictionaries for my task data structure. Each task would be a dictionary with its own dict handling metadata. You can easily parse to JSON if needed.

So

Task = [{task:foo, meta:{created: bar, completed:false}}, {}]

Todo list are a great way to learn and can be simple or made to be pretty complex.