# Diagnostics compatible with Python 2.4 - (pre)3.2.

import sys

try:
    import ConfigParser as configparser
except ImportError:
    import configparser

try:
    from StringIO import StringIO
except ImportError:
    from io import StringIO


factories = (
    configparser.RawConfigParser,
    configparser.SafeConfigParser,
    configparser.ConfigParser,
    )

version = sys.version.split()[0]

print
for factory in factories:
    cp = factory()
    cp.add_section('section')
    sio = StringIO()
    try:
        cp.set('section', 'option', None)
    except TypeError:
        print("%s %s: raised TypeError on set" % (version, factory.__name__))
    else:
        cp.write(sio)
        output = sio.getvalue()
        if output == "[section]\noption = None\n\n":
            print("%s %s: old-style output" % (version, factory.__name__))
        elif output == "[section]\noption\n\n":
            print("%s %s: new-style output" % (version, factory.__name__))
        else:
            print("%s %s: argh! %r"  % (version, factory.__name__, output))