# test subclassing a native exception


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")


class MyStopIteration(StopIteration):
    pass


print(MyStopIteration().value)
print(MyStopIteration(1).value)


class MyOSError(OSError):
    pass


print(MyOSError().errno)
print(MyOSError(1, "msg").errno)