Pyjail

Cool tricks for pyjails

Unicode

If ascii function is not called on your input, you can input unicode characters. Very helpful resource for creating unicode characters: https://lingojam.com/FancyTextGenerator
Note that unicode numbers don't work, so you have to use normal ones.

Reading files

As you know, the most common way to read any file is - print(open('flag').read()). But what if . is not allowed? You can use print(list(open('flag'))). If the file name is flag.txt then you could use chr() to get rid of the . in flag.txt.
This is very useful and that is why I am mentioning it here.