python pandas如何基于某一列修改某一列的值

df = DataFrame({"a":[1,2,3],"b":[4,5,6],"c":[7,8,9]}) df Out[12]: a b c 0 1 4 7 1 2 5 8 2 3 6 9 df.loc[df.a>=2,'b'] = 'new_data' df Out[14]: a b c 0 1 4 7 1 2

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