pandas 小技巧——用指定列的「非空值」值去填充另外一列的「空值」

舉例：有df以下python >import numpy as np >df = pd.DataFrame({"name":["apple", "pear", "pig", "dog", "cat"], "number_1":[1,np.nan,3,np.nan,5], "number_2":[np.nan, 2,3,4,5]}) >print(df) name number_1 n

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