Maybe Functions

Re:Maybe Functions by callamdelaney on Monday March 11, 2024 @11:21AM (#39669346)

Well it uses exceptions in the case your generator is at the end, not usually at the end of a for loop because a for loop by definition iterates over a list until the list is finished.

The exception actually occurs when you call next() on a generator which cannot return any more values, or is finished, in which case `StopIteration` is usually raised.

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Re:Maybe Functions by oasisaimlessly on Monday March 11, 2024 @01:32PM (#39671052)

All Python iterators raise StopIteration at the end of iteration. For-loops always use the iterator protocol. Neither generators nor lists are special in this regard.

  >>> next(iter([]))
   Traceback (most recent call last):
     File "<stdin>", line 1, in <module>
   StopIteration
  >>> next(iter((lambda: (yield 5) if False else None)()))
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
  StopIteration

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