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"""Check non-iterators returned by __iter__ """
# pylint: disable=too-few-public-methods, missing-docstring, useless-object-inheritance, consider-using-with
class FirstGoodIterator(object):
""" yields in iterator. """
def __iter__(self):
for index in range(10):
yield index
class SecondGoodIterator(object):
""" __iter__ and next """
def __iter__(self):
return self
def __next__(self):
""" Infinite iterator, but still an iterator """
return 1
def next(self):
"""Same as __next__, but for Python 2."""
return 1
class ThirdGoodIterator(object):
""" Returns other iterator, not the current instance """
def __iter__(self):
return SecondGoodIterator()
class FourthGoodIterator(object):
""" __iter__ returns iter(...) """
def __iter__(self):
return iter(range(10))
class IteratorMetaclass(type):
def __next__(cls):
return 1
def next(cls):
return 2
class IteratorClass(object, metaclass=IteratorMetaclass):
"""Iterable through the metaclass."""
class FifthGoodIterator(object):
"""__iter__ returns a class which uses an iterator-metaclass."""
def __iter__(self):
return IteratorClass
class FileBasedIterator(object):
def __init__(self, path):
self.path = path
self.file = None
def __iter__(self):
if self.file is not None:
self.file.close()
self.file = open(self.path, encoding="utf-8")
# self file has two inferred values: None and <instance of 'file'>
# we don't want to emit error in this case
return self.file
class FirstBadIterator(object):
""" __iter__ returns a list """
def __iter__(self): # [non-iterator-returned]
return []
class SecondBadIterator(object):
""" __iter__ without next """
def __iter__(self): # [non-iterator-returned]
return self
class ThirdBadIterator(object):
""" __iter__ returns an instance of another non-iterator """
def __iter__(self): # [non-iterator-returned]
return SecondBadIterator()
class FourthBadIterator(object):
"""__iter__ returns a class."""
def __iter__(self): # [non-iterator-returned]
return ThirdBadIterator
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