What does this program print?
Python
import pandas as pd
left = pd.Series([10, 20], index=["a", "b"])
right = pd.Series([1, 2], index=["b", "c"])
result = (left + right).fillna(-1).astype(int)
print(result.to_dict())
What does this program print?
from pandas Python 3.14 beginner 2 min