def follow(file, delay=<NUM_LIT:1.0>):
return Tailer(file, end=True).follow(delay)<EOL>
\
    Iterator generator that returns lines as data is added to the file.

    >>> import os
    >>> f = open('test_follow.txt', 'w')
    >>> fo = open('test_follow.txt', 'r')
    >>> generator = follow(fo)
    >>> _ = f.write('Line 1\\n')
    >>> f.flush()
    >>> next(generator)
    'Line 1'
    >>> _ = f.write('Line 2\\n')
    >>> f.flush()
    >>> next(generator)
    'Line 2'
    >>> f.close()
    >>> fo.close()
    >>> os.remove('test_follow.txt')