zacqed opened a new issue, #13505:
URL: https://github.com/apache/arrow/issues/13505
iloc equivalent for selection by position and setting values?
```
import pyarrow as pa
import pandas as pd
df = pd.DataFrame({'year': [2020, 2022, 2019, 2021],
'n_legs': [2, 4, 5, 100],
'animals': ["Flamingo", "Horse", "Brittle stars", None]})
table = pa.Table.from_pandas(df)
```
`df.loc[df["animals"].isnull(), "animals"] = "new_value" # how do we perform
this in pyarrow?`
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