TRY200.md

TRY200 - Use 'raise from' to specify cause

Why is it bad

Not specifying from when raising an exception from another gives you no clue whether the exception (given the circumstances) was intentional or whether it's a bug introduced by the programmer.

How it looks like

def main_function():
    try:
        process()
        handle()
        finish()
    except Exception:
        raise MainFunctionFailed()

How it should be

def main_function():
    try:
        process()
        handle()
        finish()
    except Exception as ex:
        raise MainFunctionFailed() from ex