circuitpython/tests/basics/subclass_native3.py

class MyExc(Exception):
    pass

e = MyExc(100, "Some error")
print(e)
print(repr(e))
print(e.args)

try:
    raise MyExc("Some error", 1)
except MyExc as e:
    print("Caught exception:", repr(e))

try:
    raise MyExc("Some error2", 2)
except Exception as e:
    print("Caught exception:", repr(e))

try:
    raise MyExc("Some error2")
except:
    print("Caught user exception")