kj wrote:
I'm trying to get the hang of Python's OO model, so I set up this
conceptually simple problem of creating a new file-like class to
read a certain type of file. The data in this type of file consists
of multiline "chunks" separated by lines consisting of a single
".".
My first crack at it looks like this:
class MyFile():
def __init__(self, f):
if hasattr(f, 'next'):
self.fh = f
else:
self.fh = file(f, 'r')
I believe open(f, 'r') does the same thing. In 3.x, 'file' is gone and
you must use 'open', so you might want to start using it now.
def __iter__(self):
return self
def next(self):
buf = []
for line in self.fh:
if line == '.\n':
break
buf.append(line)
if len(buf) == 0:
raise StopIteration
return buf
FYI, what you have written to this point is an iterator class that could
be rewritten as a generator function. You might fine that an instructive
exercise.
Terry Jan Reedy
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