Python - Flask SQLAlchemy App 未运行 - "This site can’t be reached"

Question

所以我试着学习，SQLAlchemey。我从教程中复制了代码https://www.tutorialspoint.com/flask/flask_sqlalchemy.htm

它有一个缩进错误，所以我修复了它。此外，我添加了run(use_reloader=False)，因为它没有加载。但现在它显示：

This site can’t be reached The webpage at http://127.0.0.1:6000/ might be temporarily down or it may have moved permanently to a new web address.
ERR_UNSAFE_PORT

在浏览器中。

完整的代码是

from flask import Flask, request, flash, url_for, redirect, render_template
from flask_sqlalchemy import SQLAlchemy
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///students.sqlite3'
app.config['SECRET_KEY'] = "random string"
db = SQLAlchemy(app)
class students(db.Model):
id = db.Column('student_id', db.Integer, primary_key = True)
name = db.Column(db.String(100))
city = db.Column(db.String(50))
addr = db.Column(db.String(200)) 
pin = db.Column(db.String(10))
def __init__(self, name, city, addr,pin):
self.name = name
self.city = city
self.addr = addr
self.pin = pin
@app.route('/')
def show_all():
return render_template('show_all.html', students = students.query.all() )
@app.route('/new', methods = ['GET', 'POST'])
def new():
if request.method == 'POST':
if not request.form['name'] or not request.form['city'] or not request.form['addr']:
flash('Please enter all the fields', 'error')
else:
student = students(request.form['name'], request.form['city'],
request.form['addr'], request.form['pin'])
db.session.add(student)
db.session.commit()
flash('Record was successfully added')
return redirect(url_for('show_all'))
return render_template('new.html')
if __name__ == '__main__':
db.create_all()
app.run(port=6000, use_reloader=False, debug = True)

Answer 1

尝试访问http://localhost:5000/，因为这是上的默认端口烧瓶