如何在Python中进行序列选择

Question

我尝试进行具有序列选择的自动响应。

choice = ['welcome','welcome back','nice to see you','hai dude']  
>>> welcome  
>>> welcome back  
>>> nice to see you  
>>> hai dude  
>>> welcome  
>>> welcome back  
>>> nice to see you  
>>> hai dude  

在我使用random.choice（）之前，如何从“欢迎”直到“hai dude”进行序列选择并一次又一次地回到“walcome”，但是现在我需要序列选择，任何人都可以给我建议???

Answer 1

您可以导入from itertools import cycle

来使用itertools.cycle

In [3]: c=cycle(['welcome','welcome back','nice to see you','hai dude'] )

In [4]: next(c)
Out[4]: 'welcome'

In [5]: next(c)
Out[5]: 'welcome back'

In [6]: next(c)
Out[6]: 'nice to see you'

In [7]: next(c)
Out[7]: 'hai dude'

In [8]: next(c)
Out[8]: 'welcome'

In [9]: next(c)
Out[9]: 'welcome back'

<强>更新

from itertools import cycle
c=cycle(['welcome','welcome back','nice to see you','hai dude'] )
print next(c)
print next(c)

next(c)会不断提供下一个元素。