在 for 循环中使用 str.split 时出现“ValueError 太多值无法解压”

我之前就遇到过这个错误，原因很明显，但我在处理下面的代码片段时遇到了问题。

#!/usr/bin/python

ACL = 'group:troubleshooters:r,user:auto:rx,user:nrpe:r'

for e in ACL.split(','):
  print 'e = "%s"' % e
  print 'type during split = %s' % type(e.split(':'))
  print 'value during split:  %s' % e.split(':')
  print 'number of elements:  %d' % len(e.split(':'))
  for (one, two, three) in e.split(':'):
      print 'one = "%s", two = "%s"' % (one, two)

我添加了这些打印语句进行调试，并确认拆分正在生成一个 3 元素列表，但是当我尝试将其放入 3 个变量时，我得到：

e = "group:troubleshooters:r"
type during split = <type 'list'>
value during split:  ['group', 'troubleshooters', 'r']
number of elements:  3
Traceback (most recent call last):
  File "/tmp/python_split_test.py", line 10, in <module>
for (one, two, three) in e.split(':'):
ValueError: too many values to unpack

我缺少什么？

也许你应该：

one, two, three = e.split(":")

as e.split(":")已经是一个具有三个值的迭代。

如果你写

for (one, two, three) in something

Then something必须是三个值的迭代的迭代，例如[[1, 2, 3], [4, 5, 6]]， 但不是[1, 2, 3].