如何在Pandas中将行拆分为两列

I have the following data frame:

我有以下数据框:

import pandas as pd
df = pd.DataFrame({'probegene' : ['1431492_at Lipn', '1448678_at Fam118a','1452580_a_at Mrpl21'],
                   '(5)foo.ID.LN.x2' : [130, 150,173],
                   '(5)foo.ID.LN.x1' : [20.3, 25.3,3.1]})
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