@Pavel If it is there, it is usually labelled "Pause" with "Break" below or on the front of the key. Anyway, I have it both on my laptop on on my desktop keyboard (duh, I use a Model M, which for which the key was invented).
@Pavel I envision I'll do very little Python programming. Probably not worth it. Notepad++ lets me edit multiple lines at once, so I can adjust spacing as needed.
@Adám You could also check out VS Code with the Python extension. It's a bit beefier than N++, but still works as a general purpose text editor, and lets you run python directly in the builtin console.
Also it'll automatically highlight errors
Anyway, what was it like using a "normal" programming language?
First I tried commenting out the condition and amending so it read if false # old code: but it fell over. Then I noticed there was a : at the end, so I changed it to if false: # old code: but it said it didn't know what false was. So I searched online for python false and found that it was spelled False. Finally, if False: # old code: worked!
The CTO told me to remove the disabled code, so I had to outdent the else block :-( In Dyalog APL's editor, I just press NumPad / and all whitespace is normalised.