How can the numpy arrays in column B of the DataFrame
import pandas as pd
import numpy as np
df = pd.DataFrame({"A":[1,2],"B":[np.asarray([1,2],dtype=float),np.asarray([3,4],dtype=float)]})
print(df)
A B
0 1 [1.0, 2.0]
1 2 [3.0, 4.0]
be pivoted, such that the resulting df looks like
print(df_result)
A B
0 1 1.0
1 2.0
2 2 3.0
3 4.0
?
