1、推导式的方法，只需将列表生成的[]改为()
创建生成器的方法有很多。
1 2 3 4 5 6 7 8 9 | In [26]: L = [num * 2 for num in range(5)]
In [27]: L
Out[27]: [0, 2, 4, 6, 8]
In [28]: G = (num * 2 for num in range(5))
In [29]: G
Out[29]: <generator object <funexpr> at 0x000001D62EA28248>
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2、next() 函数
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | In [30]: next(G)
Out[30]: 0
In [31]: next(G)
Out[31]: 2
In [32]: next(G)
Out[32]: 4
In [33]: next(G)
Out[33]: 6
In [34]: next(G)
Out[34]: 8
In [35]: next(G)
---------------------------------------------------------------------------
StopIteration Traceback (most recent call last)
<ipython-input-35-b4d1fcb0baf1> in <module>
----> 1 next(G)
StopIteration:
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3、for循环与list，因为G已经迭代到了ipython测试的最后，所以需要重建G，否则就没有数据了。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | In [38]: G = (num * 2 for num in range(5))
In [39]: for i in G:
...: print(i)
...:
0
2
4
6
8
In [40]: list(G)
Out[40]: []
In [41]: G = (num * 2 for num in range(5))
In [42]: list(G)
Out[42]: [0, 2, 4, 6, 8]
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以上就是python生成器创建的方法整理，希望对大家有所帮助。更多编程基础知识学习：python学习网
本文教程操作环境：windows7系统、Python 3.9.1，DELL G3电脑。
