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When you use for item in o for some iterable object o, Python calls iter(o) and expects an iterator object as the return value. An iterator is any object which implements a __next__ (or next in Python 2) method and an __iter__ method. By convention, the __iter__ method of an iterator should return the object itself (i.e. return self). Interesting Engineering on MSN: Engineered wood converts sunlight into heat, supplies solar power even in darkness Engineered wood converts sunlight into heat, supplies solar power even in darkness
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