我是沿着这个python flask 从零开始的，我现在在编辑和删除帖子一节。我完全遵循了教程，甚至复制了解决方案代码作为我编写的代码的替换，以查看是否有错误，但我仍然收到错误消息
_mysql\u exceptions.operationalerror:（1292，“截断的不正确的双精度值：'1}'）
我已经确定这段代码是问题所在，因为在我添加编辑文章部分之前，程序正在运行。

# Edit Article

@app.route('/edit_article/<string:id>', methods=['GET', 'POST'])
@is_logged_in
def edit_article(id):
    # Create cursor
    cur = mysql.connection.cursor()

    # Get article by id
    result = cur.execute("SELECT * FROM articles WHERE id = %s", [id])

    article = cur.fetchone()
    cur.close()
    # Get form
    form = ArticleForm(request.form)

    # Populate article form fields
    form.title.data = article['title']
    form.body.data = article['body']

    if request.method == 'POST' and form.validate():
        title = request.form['title']
        body = request.form['body']

        # Create Cursor
        cur = mysql.connection.cursor()
        app.logger.info(title)
        # Execute
        cur.execute ("UPDATE articles SET title=%s, body=%s WHERE id=%s",(title, body, id))
        # Commit to DB
        mysql.connection.commit()

        #Close connection
        cur.close()

        flash('Article Updated', 'success')

        return redirect(url_for('dashboard'))

    return render_template('edit_article.html', form=form)

完整代码：

from flask import Flask, render_template, flash, redirect, url_for, session, logging, request
from flask_mysqldb import MySQL
from wtforms import Form, StringField, TextAreaField, PasswordField, validators
from passlib.hash import sha256_crypt
from functools import wraps

app = Flask(__name__)

# Config MySQL

app.config['MYSQL_HOST'] = 'localhost'
app.config['MYSQL_USER'] = 'root'
app.config['MYSQL_PASSWORD'] = '***************'
app.config['MYSQL_DB'] = 'myflaskapp'
app.config['MYSQL_CURSORCLASS'] = 'DictCursor'

# init MySQL

mysql = MySQL(app)

# Index

@app.route('/')
def index():
    return render_template('home.html')

# About

@app.route('/about')
def about():
    return render_template('about.html')

# Articles

@app.route('/articles')
def articles():
    # Create cursor
    cur = mysql.connection.cursor()

    # Get articles
    result = cur.execute("SELECT * FROM articles")

    articles = cur.fetchall()

    if result > 0:
        return render_template('articles.html', articles=articles)
    else:
        msg = 'No Articles Found'
        return render_template('articles.html', msg=msg)

    # Close connection
    cur.close()

# Single Article

@app.route('/article/<string:id>/')
def article(id):
    # Create cursor
    cur = mysql.connection.cursor()

    # Get article
    result = cur.execute("SELECT * FROM articles WHERE id = %s", [id])

    article = cur.fetchone()

    return render_template('article.html', article=article)

# Register Form Class

class RegisterForm(Form):
    name = StringField('Name', [validators.Length(min=1, max=50)])
    username = StringField('Username', [validators.Length(min=4, max=25)])
    email = StringField('Email', [validators.Length(min=6, max=50)])
    password = PasswordField('Password', [
        validators.DataRequired(),
        validators.EqualTo('confirm', message='Passwords do not match')
    ])
    confirm = PasswordField('Confirm Password')

# Register

@app.route('/register', methods=['GET', 'POST'])
def register():
    form = RegisterForm(request.form)
    if request.method == 'POST' and form.validate():
        name = form.name.data
        email = form.email.data
        username = form.username.data
        password = sha256_crypt.encrypt(str(form.password.data))

        # Create cursor
        cur = mysql.connection.cursor()

        # Execute query
        cur.execute("INSERT INTO users(name, email, username, password) VALUES(%s, %s, %s, %s)", (name, email, username, password))

        # Commit to DB
        mysql.connection.commit()

        cur.close()

        flash('You are now registered and can log in', 'positive')

        return redirect(url_for('login'))
    return render_template('register.html', form=form)

# User Login

@app.route("/login", methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        # Get Form Fields
        username = request.form['username']
        password_candidate = request.form['password']

        # Create cursor
        cur = mysql.connection.cursor()

        # Get User by username
        result = cur.execute("SELECT * FROM users WHERE username = %s", [username])

        if result > 0:
            # Get stored hash
            data = cur.fetchone()
            password = data['password']

            # Compare passwords
            if sha256_crypt.verify(password_candidate, password):
                # Passed
                session['logged_in'] = True
                session['username'] = username

                flash('You are now logged in', 'success')
                return redirect(url_for('dashboard'))

            else:
                error = 'Invalid login'
                return render_template('login.html', error=error)
            # Close connection
            cur.close()
        else:
            error = 'Username not found'
            return render_template('login.html', error=error)

    return render_template('login.html')

# Check if user logged in / unauthorized

def is_logged_in(f):
    @wraps(f)
    def wrap(*args,**kwargs):
        if 'logged_in' in session:
            return f(*args,**kwargs)
        else:
            flash('Unauthorized, Please login', 'negative')
            return redirect(url_for('login'))
    return wrap

# Logout

@app.route('/logout')
@is_logged_in
def logout():
    session.clear()
    flash('You are now logged out', 'positive')
    return redirect(url_for('login'))

# Dashboard

@app.route('/dashboard')
@is_logged_in
def dashboard():

    # Create cursor
    cur = mysql.connection.cursor()

    # Get articles
    result = cur.execute("SELECT * FROM articles")

    articles = cur.fetchall()

    if result > 0:
        return render_template('dashboard.html', articles=articles)
    else:
        msg = 'No Articles Found'
        return render_template('dashboard.html', msg=msg)

    # Close connection
    cur.close()

# Article Form Class

class ArticleForm(Form):
    title = StringField('Title', [validators.Length(min=1, max=200)])
    body = TextAreaField('Body', [validators.Length(min=30)])

# Add Article

@app.route('/add_article', methods=['GET', 'POST'])
@is_logged_in
def add_article():
    form = ArticleForm(request.form)
    if request.method == 'POST' and form.validate():
        title = form.title.data
        body = form.body.data

        # Create Cursor
        cur = mysql.connection.cursor()

        # Execute
        cur.execute("INSERT INTO articles(title, body, author) VALUES(%s, %s, %s)", (title, body, session['username']))

        # Commit to DB
        mysql.connection.commit()

        # Close Connection
        cur.close()

        flash('Article Created', 'positive')

        return redirect(url_for('dashboard'))

    return render_template('add_article.html', form=form)

# Edit Article

@app.route('/edit_article/<string:id>', methods=['GET', 'POST'])
@is_logged_in
def edit_article(id):
    # Create cursor
    cur = mysql.connection.cursor()

    # Get article by id
    result = cur.execute("SELECT * FROM articles WHERE id = %s", [id])

    article = cur.fetchone()
    cur.close()
    # Get form
    form = ArticleForm(request.form)

    # Populate article form fields
    form.title.data = article['title']
    form.body.data = article['body']

    if request.method == 'POST' and form.validate():
        title = request.form['title']
        body = request.form['body']

        # Create Cursor
        cur = mysql.connection.cursor()
        app.logger.info(title)
        # Execute
        cur.execute ("UPDATE articles SET title=%s, body=%s WHERE id=%s",(title, body, id))
        # Commit to DB
        mysql.connection.commit()

        #Close connection
        cur.close()

        flash('Article Updated', 'success')

        return redirect(url_for('dashboard'))

    return render_template('edit_article.html', form=form)

if __name__ == '__main__':
    app.secret_key = 'secret123'
    app.run(debug=True)