grokking generators and iterators

[Alex Martelli]

Bob Horvath wrote:
        ...
> How would you suggest writing a generator that spits out 5 line chunks
> of a file at a time?
> 
> How would you do it without generators?

class atatime:
    def __init__(self, S, n=5):
        self.it = iter(S)
        self.r = range(n)
    def next(self):
        return [self.it.next() for i in self.r]
    def __iter__(self):
        return self

for li5 in atatime(open('somefile')):
    print '5 more lines:', li5


Alex