“ValueError 值太多，无法解包"在 for 循环中使用 str.split 时 [英] "ValueError too many values to unpack" when using str.split in a for loop

问题描述

我之前在原因很明显的地方遇到过这个错误，但我在处理下面的这个片段时遇到了问题.

I've gotten this error before where the cause was obvious, but I'm having trouble with this snippet below.

#!/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)

我已经添加了那些用于调试的打印语句，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:

I've added those print statements for debugging, and have confirmed that the split is producing a 3-element list, but when I try to put that into 3 variables, I get:

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

我错过了什么?

推荐答案

也许你应该:

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

as e.split(":") 已经是一个具有三个值的可迭代对象.

as e.split(":") is already an iterable with three values.

如果你写

for (one, two, three) in something

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

Then something must be an iterable of iterable of three values, e.g. [[1, 2, 3], [4, 5, 6]], but not [1, 2, 3].

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