Say I have a dataframe

import pandas as pd
import numpy as np
foo = pd.DataFrame(np.random.random((10,5)))

and I create another dataframe from a subset of my data:

bar = foo.iloc[3:5,1:4]

does bar hold a copy of those elements from foo? Is there any way to create a view of that data instead? If so, what would happen if I try to modify data in this view? Does Pandas provide any sort of copy-on-write mechanism?

python pandas chained-assignment
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