# import necessary libraries
import pandas as pd
import numpy as np

# create a sample series
series = pd.Series([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])

# use numpy corrcoef()
lag = 1
result = np.corrcoef([series[:-lag], series[lag:]])[0, 1]

# print the results
print(f"The autocorrelation is: {result}")