python - 值错误 : need more than 2 values to unpack in Python 2. 6.6

Question

我收到错误:ValueError:需要超过 2 个值才能解包 当我现在运行单元测试时，有 2 次失败和 1 次跳过 据我所知

lambda i: get_error_count(self._error_lookup, i))

line 142 of source is the method

for test, err, capt in errors:

which has the line of code:

count = get_error_count(i)

reference Python 3.0 has something a bit like this. Excess values can be bound (as a list) to the last variable:

a,b,*c = [1,2,3,4,5]

will result in c containing [3,4,5].

In Python 2.x, you can't do that directly, but you should be able to create a function that lengthens or shortens an input tuple of arguments to the correct length so you can do:

a,c,b = fix(1,2)
d,e,f = fix(1,2,3,4)

However, the function won't know the length of the left hand side sequence, so it will have to be passed in as an extra parameter or hard coded.

so the

count = get_error_count(i)
uses only one variable, where as
def get_error_count(lookup, index):
takes on 2

What should i use as the second variable ? to fix this ?

Thanks, -Kamal.

-------------------- >> begin captured stdout << ---------------------

\ test_many_errors.test_assert_one ... FAIL test_many_errors.test_one ... ok test_many_errors.test_assert_two ... ERROR test_many_errors.test_two ... ok test_many_errors.test_value_one ... ERROR test_many_errors.test_value_two ... SKIP: (, ValueError(), ) test_many_errors.test_good_one ... ok test_many_errors.test_good_two ... ok

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/Current/bin/nosetests", line 10, in <module>
    sys.exit(run_exit())
  File "/Library/Frameworks/Python.framework/Versions/6.3/lib/python2.6/site-packages/nose/core.py", line 117, in __init__
    **extra_args)
  File "/Library/Frameworks/Python.framework/Versions/6.3/lib/python2.6/unittest.py", line 817, in __init__
    self.runTests()
  File "/Library/Frameworks/Python.framework/Versions/6.3/lib/python2.6/site-packages/nose/core.py", line 196, in runTests
    result = self.testRunner.run(self.test)
  File "/Library/Frameworks/Python.framework/Versions/6.3/lib/python2.6/site-packages/nose/core.py", line 63, in run
    result.printErrors()
  File "/NOSE_TRIM/nosetrim-read-only/nosetrim/nosetrim.py", line 136, in printErrors
    lambda i: get_error_count(self._error_lookup, i))
  File "/NOSE_TRIM/nosetrim-read-only/nosetrim/nosetrim.py", line 142, in printErrorList
    for test, err, capt in errors:
ValueError: need more than 2 values to unpack

/

-------------------->> 结束捕获的标准输出 << ------------------ ---

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在 1.263 秒内运行 3 次测试

Answer 1

而不是在你的作业中解包:

a, b, c = do_something()

尝试将结果分配给单个变量并测试其长度:

t = do_something()
# t is now a tuple (or list, or whatever was returned) of results
if len(t) > 2:
    # Can use the third result!
    c = t[2]