BeautifulSoup to get string inner 'p' and 'a' tags

[GinTon]

I'm trying to get the 'FOO' string but the problem is that inner 'P'
tag there is another tag, 'a'. So:

> from BeautifulSoup import BeautifulSoup
> s = '<td width="88%" valign="TOP"> <p class="contentBody">FOO <a name="f"></a> </p></td>'
> tree = BeautifulSoup(s)

> print tree.first('p')
<p class="contentBody">FOO <a name="f"></a> </p>

So if I run 'print tree.first('p').string' to get the 'FOO' string it
shows Null value because it's the 'a' tag:

> print tree.first('p').string
Null

Any solution?