条件判断

from flask import Flask, render_template


app = Flask(__name__)

@app.route("/user/<user_id>")
def get_user(user_id):
    user = None
    if int(user_id) == 1:
        user = "kevin durant"
    return render_template("index.html", user=user)


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

#index.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>title</title>
</head>
<body>
{% if user %}
    hello, you are {{ user }}
{% else %}
    sorry, do not find your name
{% endif %}
</body>
</html>
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原文地址：https://www.cnblogs.com/themost/p/8452942.html