如何使用python使用特定规则对元组进行排序

Question

我有一个元组：

[('site-nfv01-swsto01',), ('site-nfv01-swsto01V',),('site-nfv01-swsto02',),('site-nfv02-swsto02',), ('site-nfv02-swsto01',) , ('site-nfv02-swsto01V',)]

我想按以下顺序对其进行分类：

site-nfv01-swsto01V
site-nfv01-swsto01
site-nfv01-swsto02
site-nfv02-swsto01V
site-nfv02-swsto01
site-nfv02-swsto02

拥有：[('site-nfv01-swsto01V',), ('site-nfv01-swsto01',),('site-nfv01-swsto02',),('site-nfv02-swsto01V',), ('site-nfv02-swsto01',) , ('site-nfv02-swsto02',)]

574想法是首先按升序对NFV部分进行分类，然后，我们也按升序对SWSTO进行分类，但将以“V”结尾的SWSTO放在第一位

我该怎么做

Answer 1

最好的方法是为sorted函数使用key参数

从docs：

The value of the key parameter should be a function that takes a single argument and returns a key to use for sorting purposes. This technique is fast because the key function is called exactly once for each input record.

要对代码列表进行排序，我将执行以下操作：

your_list = [('site-nfv01-swsto01',), ('site-nfv01-swsto01V',),('site-nfv01-swsto02',),('site-nfv02-swsto02',), ('site-nfv02-swsto01',) , ('site-nfv02-swsto01V',)]
#sort using key parameter
#key must be a function that returns a new value to be sorted
#this particular key function checks if 'V' is at the last position, 
#leaves the code unchanged if true,
#else adds arbitrary string at the end of the code that will cause the code to be sorted after codes with the same content at the beginning but lacking the 'V'
#in this case I chose 'z' which comes after 'v' in the alphabet
sorted_list = sorted(your_list, key=lambda code: code[0] if code[0][-1] == 'V'  else code[0]+'z')

如果您不知道lambda表达式是如何工作的，请查看docs