p5.js won't load into global mode unless it sees setup() or draw() defined on the page.

Option 1 - force global mode. (Note that if you do this, createCanvas() won't do you much good in the console, since setup() will have already run on page load.)

<script src=static/js/p5.js> </script>

<script>

    function setup() {

        //...

    }

</script>

Option 2 - use instance mode. (This is probably your best bet if you really want to use p5.js from the console.)

var s = function( sketch ) {

  sketch.setup = function() {

    sketch.createCanvas(700, 410);

    //...

  };

};    

var myp5 = new p5(s);