Sending data back from Javascript to Python

I am very new to Python / Flask / Javascript, and would appreciate it if someone could help me with this.

I am trying to pass a string value from Javascript back to Python but it does not seem to work. My code is as follows:

Javascript (partial code):

var bounds = '8.3,9,34.3,15.9';
$.post("/receiver", {
    bbox_bounds: bounds
});

In Python:

from flask import Flask, request

#Create the Flask app
app = Flask(__name__)

@app.route('/receiver', methods = ['POST'])
def receiver():
    bbounds = request.form('bbox_bounds')
    print "Bounds: " + bbounds
    return bbounds



if __name__ == '__main__':
    app.run(port=5000)

Sorry, the above is bad, but I am really a beginner. Thank you.