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Must have equal len keys and value when setting with an ndarray

ValueError: Must have equal len keys and value when setting with an ndarray

df = pd.DataFrame(data={'A': [1, 2, 3], 'B': ['x', 'y', 'z']})

df.at[1, 'B'] = ['m', 'n']

df =
    A   B
0   1   x
1   2   [m, n]
2   3   z

0

Source: stackoverflow.com

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