是的.这发生了.当我心不在焉地把一个索引放在变量中时.解释(它？).在一般情况下发生了什么以及它的用例是什么？
>>> [q for q[0] in [range(10),range(10,-1,-1)]]
Traceback (most recent call last):
File "<pyshell#209>", line 1, in <module>
[q for q[0] in [range(10),range(10,-1,-1)]]
NameError: name 'q' is not defined
>>> [q for q in [range(10),range(10,-1,-1)]]
[[0, 1, 2, 3, 4, 5, 6, 7, 8, 9], [10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0]]
>>> [q for q[0] in [range(10),range(10,-1,-1)]]
[[[10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0], 9, 8, 7, 6, 5, 4, 3, …