Show HN: Create Matplotlib visualizations from the command-line

I do lots of data analyses in the command-line and I was missing a simple utility to plot the output of a command (without having to script it). I like very much the Matplotlib API but I found no CLI to pipe data into it. So, I wrote MatplotCLI, a simple CLI that reads data from the stdin and allows to easily create interactive plots from the command-line. Have a look at the README for examples and recipes. Let me know what you think, thanks!

Some examples:

    $ plt "hist(x,30)" < sample.json

    $ cat sample.json | plt --no-show "hist(x,30); savefig('myimage.png')"

    $ plt --no-input "
    x = np.linspace(-1,1,2000);
    y = x*np.sin(1/x);
    plot(x,y);
    axis('scaled');
    grid(True)"

    $ echo '
        {"a":0, "b":1}
        {"a":1, "b":0}
        {"a":3, "b":3}' |
    plt "plot(a,b)"