valhallasw added a subscriber: valhallasw.
valhallasw added a comment.
It has to do with the hairy business of iterators versus generators in python:
## current code
class IteratorExample(object):
def __iter__(self):
yield 1
i = IteratorExample()
print list(i)
print list(i) # this is confusing
## 'typical' use of __iter__
class IteratorExample(object):
def __init__(self):
self.returnvalues = [1]
def __iter__(self):
return self
def next(self):
try:
return self.returnvalues.pop()
except:
raise StopIteration()
i = IteratorExample()
print list(i)
print list(i) # this now makes sense
## how to go from (1) to (2) with minimal changes?
class IteratorExample(object):
def __init__(self):
self.gen = self._gen()
def _gen(self):
yield 1
def __iter__(self):
return self
def next(self):
return self.gen.next()
i = IteratorExample()
print list(i)
print list(i) # this now makes sense, but the boilerplate code is... meh.
TASK DETAIL
https://phabricator.wikimedia.org/T85204
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