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<pre><code>>>> import itertools
>>> n = [1,2,3,4]
>>> combObj = itertools.combinations(n,3)
>>>
>>> combObj
<itertools.combinations object at 0x00000000028C91D8>
>>>
>>> list(combObj)
[(1, 2, 3), (1, 2, 4), (1, 3, 4), (2, 3, 4)]
>>>
>>> for i in list(combObj): #This prints nothing
... print(i)
...
</code></pre>
<ol>
<li><p>如何迭代combObj?</p></li>
<li><p>如何转换<br/>
<code>[(1, 2, 3), (1, 2, 4), (1, 3, 4), (2, 3, 4)]</code><br/>
至<br/>
<code>[[1, 2, 3], [1, 2, 4], [1, 3, 4], [2, 3, 4]]</code></p></li>
</ol>