Iterators
dictionary
在 for 循环中用 iter
>>> for i in range(3,6):
>>> print(i)
3
4
5
>>> for i in range(3,6):
>>> print(i)
3
4
5
# 如果
>>> ri = iter(range(3,6))
>>> for i in ri:
print(i)
3
4
5
>>> for i in ri:
>>> print(i)
>>>Build-in Iterator Functions
生成器(generator)
yield from
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