Place both series in Python’s set container then use the set intersection method:

```
s1.intersection(s2)
```

and then transform back to list if needed.

Just noticed pandas in the tag. Can translate back to that:

```
pd.Series(list(set(s1).intersection(set(s2))))
```

From comments I have changed this to a more Pythonic expression, which is shorter and easier to read:

```
Series(list(set(s1) & set(s2)))
```

should do the trick, except if the index data is also important to you.

Have added the `list(...)`

to translate the set before going to pd.Series as pandas does not accept a set as direct input for a Series.