# 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 pd.concat() and specify the
# drop_duplicates argument
result = pd.concat([ser1, ser2]).drop_duplicates(keep = False)

# print the result
print(*result.values, sep = '\n')