您可以将关键字参数传递assign为字典，如下所示：
kwargs = {"ln(A)" : lambda x: np.log(x.A)}
df.assign(**kwargs)
A B ln(A)
0 1 0.500033 0.000000
1 2 -0.392229 0.693147
2 3 0.385512 1.098612
3 4 -0.029816 1.386294
4 5 -2.386748 1.609438
5 6 -1.828487 1.791759
6 7 0.096117 1.945910
7 8 -2.867469 2.079442
8 9 -0.731787 2.197225
9 10 -0.686110 2.302585
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