I wanted to write a logger-like class and wondered, "Which would be more readable, using a generator or a class?" So I wrote and compared both.

Generator

def logger(output_file):
    with open(output_file, 'w') as fp:
        while True:
            text = (yield None)
            fp.write(text + '\n')
            print text


l = logger('test-python.log')
l.next()
l.send('The quick')
l.send('Brown fox')
l.send('Jumps over')
l.send('The lazy dog.')

Class

class Logger(object):
    def __init__(self, output_file):
        self.fp = open(output_file, 'w')

    def write(self, text):
        self.fp.write(text + '\n')
        print text

    def close(self):
        self.fp.close()


l = Logger('test-python.log')
l.write('The quick')
l.write('Brown fox')
l.write('Jumps over')
l.write('The lazy dog.')
l.close()

Output Result

The quick
Brown fox
Jumps over
The lazy dog.

Well, the class wins.