Duncan Gibson wrote: > > > > import csv > > > > class MyReader(object): > > > > def __init__(self, inputFile): > > self.reader = csv.reader(inputFile, delimiter=' ') > > self.lineNumber = 0 > > > > def __iter__(self): > > self.lineNumber += 1 > > return self.reader.__iter__() > > > > Is there some other __special__ method that I need to forward to the > > csv.reader, or have I lost all control once __iter__ has done its job?
Kent Johnson wrote: > __iter__() should return self, not self.reader.__iter__(), otherwise > Python is using the actual csv.reader not your wrapper. And don't > increment line number here. > > You lost control because you gave it away. Thanks Kent. The penny has dropped and it makes a lot more sense now. I was looking for at __iter__ as a special function that *created* an iterator, but all it really does is signal that the returned object will implement the iterator interface, and the next() method in particular. Cheers Duncan _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
