Looking for values in nested tuple
<p>Say I have:</p>

<pre><code>t = (
    ('dog', 'Dog'),
    ('cat', 'Cat'),
    ('fish', 'Fish'),
)
</code></pre>

<p>And I need to check if a value is in the first bit of the nested tuple (ie. the lowercase bits). How can I do this? The capitalised values do not matter really, I want to search for a string in only the lowercase values.</p>

<pre><code>if 'fish' in t:
    print "Fish in t."
</code></pre>

<p>Doesn't work.</p>

<p>Is there a good way of doing this without doing a for loop with if statements?</p>
