"jinja2.exceptions.UndefinedError: 'url_for' is undefined". Where is the problem here?

D

Den98632022-03-03 18:46:08

Flask

Den9863, 2022-03-03 18:46:08

from flask import Flask, url_for
from flask import render_template
from jinja2 import Environment, FileSystemLoader

app = Flask(__name__)

persons = [
    {"name": "Алексей", "old": 18, "weight": 78.5},
    {"name": "Николай", "old": 28, "weight": 82.3},
    {"name": "Иван", "old": 33, "weight": 94.0}
]

file_loader = FileSystemLoader('templates')
env = Environment(loader=file_loader)

tm = env.get_template('/index.html')
msg = tm.render(persons=persons)
print(msg)


@app.route("/")
def index():
    print(url_for('index'))
    return render_template('index.html', persons=persons)


if __name__=="__main__":
    app.run(debug=True)

<!DOCTYPE html>
<html>
<head>
<link type="text/css" href="{{ url_for('static', filename='css/style.css')}}" rel="stylesheet" />
</head>
<body>
<div class=page>hello</div>
<ul>
{% for u in persons -%}
{{u.name,u.old}}
{% endfor -%}
</ul>
</body>
</html>

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1 answer(s)

D

Dr. Bacon, 2022-03-03
@bacon

why is this here?

file_loader = FileSystemLoader('templates')
env = Environment(loader=file_loader)

tm = env.get_template('/index.html')
msg = tm.render(persons=persons)
print(msg)