Do IOError and OSError catch each other correctly?

test_ioerror.py

"""IOError and OSError are seemingly interchangeable!

The reference docs encourage using OSError; however, they seemingly
work with each other just fine.
"""


def raise_ioerr():
    raise IOError


def raise_oserr():
    raise OSError


def catch_io():
    try:
        raise_oserr()
    except IOError:
        print("IOError catches OSError")


def catch_os():
    try:
        raise_ioerr()
    except OSError:
        print("OSError catches IOError")


def main():
    catch_io()
    catch_os()


if __name__ == "__main__":
    main()