series_apply.py

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# Expected:
# London      400
# New York    441
# Helsinki    144
# dtype: int64

import pandas as pd
import numpy as np
from numba import njit


@njit
def series_apply():
    s = pd.Series([20, 21, 12],
                  index=['London', 'New York', 'Helsinki'])

    def square(x):
        return x ** 2

    return s.apply(square)


print(series_apply())