gistfile1.py

def prettyfy(o, level=''):
    nextlevel = level + '  '
    if isinstance(o, dict):
        return '{\n' + ',\n'.join(['{}{!s}: {}'.format(nextlevel, k, prettyfy(v, nextlevel)) for k, v in o.iteritems()]) + '\n' + level + '}'
    elif isinstance(o, list):
        return '[\n' + ',\n'.join(['{}{}'.format(nextlevel, prettyfy(v, nextlevel)) for v in iter(o)]) + '\n' + level + ']'
    elif isinstance(o, set):
        return '{\n' + ',\n'.join(['{}{}'.format(nextlevel, prettyfy(v, nextlevel)) for v in iter(o)]) + '\n' + level + '}'
    elif isinstance(o, tuple):
        return '(\n' + ',\n'.join(['{}{}'.format(nextlevel, prettyfy(v, nextlevel)) for v in iter(o)]) + '\n' + level + ')'
    else:
        return repr(o)

def prettyprint(o):
    print prettyfy(o)