# import necessary libraries
import pandas as pd

# define your series
ser1 = pd.Series([1, 2, 3, 4, 5])
ser2 = pd.Series([3, 4, 5, 6, 7])

# using isin() both ways
unique_ser1 = ser1[~ser1.isin(ser2)]
unique_ser2 = ser2[~ser2.isin(ser1)]

# print the results
print(*unique_ser1, sep = '\n')
print(*unique_ser2, sep = '\n')