Lab Day

I'd like to do a better job on some of the things we talked about yesterday.

• The Lookup assignment only uses GET, so you can ignore all our discussion of POST
• The FORM should specify the ACTION: the endpoint that will handle the form submission
• url_for:
  • takes 1 required positional argument, which is the name of the handler function, as a string
  • takes any number of keyword arguments, which are the names of the arguments to the handler function and their values

Examples:

@app.route('/square/<num>')
def square(num):
    n = float(num)
    return ('<p>{x}<sup>2</sup> is {x2}</p>'.format(x=n, x2=n*n))

@app.route('/div/<num>/<denom>')
def div(num, denom):
    ratio = float(num)/float(denom)
    return('<p>{x} over {y} is {z}</p>'.format(x=num, y=denom, z=ratio))

 url_for('square', num=18) # returns /square/18
 url_for('div', num=4, denom=2)  # returns /div/4/2
 url_for('div', denom=2, num=4), # returns /div/4/2

Let's explore the solution

We'll walk through it very carefully and learn what we can:

• what does the FORM look like
• what do the requests look like
• what does the response chain look like
• anything else