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並前往https://stackoverflow.com/questions/69954697/why-does-loc-assignment-with-two-sets-of-brackets-result-in-nan-in-a-pandas-dat

Why does .loc assignment with two sets of brackets result in ...

Non matching indices and columns are filled with NaN . Example from Data Alignment and Arthimetics. df = pd.DataFrame(np.random.randn(10, 4) ...

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