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Python Flask Basics Welcome to Flask Multiply View

mike henning
mike henning
1,384 Points

I'm still confused

from flask import Flask

app = Flask(__name__)
app = Flask(_multiply_)

@app.route('/')
@app.route('/multiply/<num1>/<num2>')
@app.route('/multiply/<int:num1>/<num2>')
@app.route('/multiply/<num1>/<int:num2>')
@app.route('/multiply/<int:num1>/<int:num2>')
@app.route('/multiply/<float:num1>/<float:num2>')
@app.route('/multiply/<float:num1>/<num2>')
@app.route('/multiply/<num1>/<float:num2>')

def multiply(num1,num2):
    return '{}' .format(num1*num2)

I'm getting an error : NameError: name 'multiply' is not defined

and also I don't understand how to make default values

flask_app.py
from flask import Flask

app = Flask(__name__)
app = Flask(_multiply_)

@app.route('/')
@app.route('/multiply/<num1>/<num2>')
@app.route('/multiply/<int:num1>/<num2>')
@app.route('/multiply/<num1>/<int:num2>')
@app.route('/multiply/<int:num1>/<int:num2>')
@app.route('/multiply/<float:num1>/<float:num2>')
@app.route('/multiply/<float:num1>/<num2>')
@app.route('/multiply/<num1>/<float:num2>')

def multiply(num1,num2):
    return '{}' .format(num1*num2)

2 Answers

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 67,515 Points

Hey mike henning, you have all the parts, but they need some adjusting.

  • remove the line app = Flask(_multiply_)
  • route '/multiply' does not need trailing /
  • the unqualified route '/multiply/<num1>/<num2>' will match everything making the subsequent routes ignored. Make sure all “num” variables in routes use one of int: or float:. (There are 4 combinations)
  • need default values for num1 and num2 since the ’/multiply’ route does not specify those parameters:(num1=5, num2=5)`
  • remove blank line between decorators and function definition
  • remove space before .format method

Post back if you need more help. Good luck!!!

mike henning
mike henning
1,384 Points
from flask import Flask
app = Flask(__name__)

@app.route('/')
@app.route('/multiply<int:num1>/<num2>')
@app.route('/multiply<num1>/<int:num2>')
@app.route('/multiply<float:num1>/<num2>')
@app.route('/multiply<num1>/<float:num2>')

def multiply(num1, num2):
    return '{}'.format(num1*num2)
  1. I don't understand "route '/multiply' does not need trailing /" did that mean to take out the / after all my @app.route('/multiply ???

2.im still confused "need default values for num1 and num2 since the ’/multiply’ route does not specify those parameters:(num1=5, num2=5)`" do I need to add a route that makes a default values (num1=5, num2=5).. I know we didn't cover parameters in flask so I don't how to make that connection.

  1. I'm feeling really disconnected to the lesson.. I don't remember where we talk about multiply and making default values. I tried using what I learned in ADDING but there was nothing about making default values.
Chris Freeman
Chris Freeman
Treehouse Moderator 67,515 Points
  • You need 6 routes: ‘/‘, ‘/multiply’, and the four combinations of ‘/multiply/...’ with the various ints and floats.
  • the default values are for the function parameter definition. The are covered in Basic Python and is a prerequisite for the Flask course.

Hope this helps

mike henning
mike henning
1,384 Points

now that im looking at i havent started the basic python i dont know how i pass that. thank you