On Ubuntu 10.04 by default Python 2.6 is installed, then I have installed Python 2.7. How can I use `pip install` to install packages for Python 2.7.

For example:

```
pip install beautifulsoup4

```

by default installs BeautifulSoup for Python 2.6

When I do:

```
import bs4

```

in Python 2.6 it works, but in Python 2.7 it says:

```
No module named bs4

```