select sub item in a tuple list in python
<p>Here I have one list like this:</p>

<p><code>a = [[13245,0.123],[12435,0.435],[12345,0.799],[98775,0.573]...]</code></p>

<p>I want to use the first item in every tuple as x axis, and the second item in every tuple as y axis to plot a figure.</p>

<p>like <code>x = [13245,12435,12345,68775] y = [0.123,0.435,0.799,0.573]</code></p>

<p>How can I select them out?</p>
