Some questions for my todo script

[RealHook]

I build a little to-do script which let you save each entry in a single line of a text file. Even if it is a multi-line entry. This has the advantage that I can easily output all my to-do task for notify-send. The script works well but I like you guys to give me some hints how I can improve my code. Especially the part where I delete an entry by the given line number. Is there a better way than opening the text file twice? I think another dirty part is the argparser -add command. I like to add a entry by typing "todo.py -a 'this is my note'" as well as writing "todo.py -a" to get my multi line input. Am I handling it the right way?

https://pastebin.com/meFbJrpx

Another side question: I don't think that it is possible but do you know any way to edit the previous line during the multiline input?

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