Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Python Flask Basics Welcome to Flask View Args Through URL

mike henning
mike henning
1,384 Points

3 of 3 explain

from flask import Flask

app = Flask(__name__)

def hello(name="treehouse"):
     return 'Hello {}' .format(name)

I need help understanding why now an argument is now just adding a string inside

Def hello(name=“treehouse”):


Name= request.args.get(name,”treehouse”)

1 Answer

Chris Freeman
Chris Freeman
Treehouse Moderator 68,423 Points

Hey mike henning, good question.

Once the route ’/<name>’ is added, the function needs to accept an argument from this route. So (name) is added.

However, since the original route ’/‘ is still valid, this will cause an error because this original route will call the function with no arguments when one is now required.

To prevent this missing argument error, a default is defined: (name=“treehouse”)

So, effectively, the route / is automatically turned into /treehouse.

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