>>> import pandas as pd
>>> s1 = pd.Series([4,5,6,20,42])
>>> s2 = pd.Series([1,2,3,5,42])
# 求交集 #
>>> pd.Series(list(set(s1).intersection(set(s2))))
0    42
1     5
dtype: int64

# 求并集 #
>>> pd.Series(list(set(s1).union(set(s2))))
0     1
1     2
2     3
3     4
4     5
5     6
6    42
7    20
dtype: int64