Flask · question
Question 5 of 56
What is URL building and how do you use `url_for()`?
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Re-explain
url_for() generates URLs for routes by endpoint name, providing URL reversal:
from flask import url_for
@app.route('/user/<username>')
def user_profile(username):
return f'Profile for {username}'
@app.route('/')
def index():
# Generate URL for user_profile endpoint
profile_url = url_for('user_profile', username='john')
return f'<a href="{profile_url}">John\'s Profile</a>'
Benefits include automatic URL updates when routes change and proper URL escaping.
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