series_combine.py

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import pandas as pd
from numba import njit


@njit
def series_combine():
    s1 = pd.Series([1, 5, 2])
    s2 = pd.Series([0, 3, 7, 8, 0])

    return s1.combine(s2, max, fill_value=0)  # Expect series of 1, 5, 7, 8, 0


print(series_combine())