Za*_*uri 4 python flask flask-sqlalchemy
我正在学习基本的 Flask，但无法从 freecodecamp 导入 db(数据库) 我找不到解决方案，请尽快回答此查询 有 4 个文件：当我从 app import db 写入时，pythonshell 显示错误
应用程序.py
from flask import Flask,render_template, url_for
from flask_sqlalchemy import SQLAlchemy
from datetime import datetime
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URL'] = 'sqlite://test.db'
db = SQLAlchemy(app)
class Todo(db.Model):
id = db.Column(db.Integer, primary_key = True)
content = db.Column(db.String(200), nullable = False)
date_created = db.Column(db.DateTime, default = datetime.utcnow)
def __repr__(self):
return '<Task %r>' % self.id
@app.route('/')
def index():
return render_template('index.html')
if __name__ == "__main__":
app.run(debug = True)
main.css
body {
margin: 0;
font-family: sans-serif;
}
基本.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width-device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie-edge">
<link rel="stylesheet" href= "{{ url_for('static', filename = 'css/main.css')}}">
{% block head %}{% endblock %}
</head>
<body>
{% block body %}{% endblock %}
</body>
</html>
索引.html
{% extends 'base.html'%}
{% block head %}
{% endblock %}
{% block body %}
<h1>Template</h1>
{% endblock %}
db您还需要初始化，
db = SQLAlchemy() # db intitialized here
app = Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite://test.db"
db.init_app(app)
它SQLALCHEMY_DATABASE_URI不是SQLALCHEMY_DATABASE_URL
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