Usage example of next() in python iterator

>>> g = (x ** 2 for x in range(10))
>>> next(g)
0
>>> next(g)
1
>>> next(g)
4
>>> next(g)
9
>>> next(g)
16
>>> next(g)
25
>>> next(g)
36
>>> next(g)
49
>>> next(g)
64
>>> next(g)
81
>>> next(g)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
StopIteration

Every time next is called, the iterator is iterated, and a StopIteration error will be triggered in the end.

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