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【单选题】
import pandas as pd dt = {'one': [9, 8, 7, 6], 'two': [3, 2, 1, 0]} a = pd.DataFrame(dt) 希望获得[3, 2, 1, 0],使用如下哪个语句?A.
a.colums[1]
B.
a.ix[1]
C.
a.index[1]
D.
a[1]
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