MySQLdb._exceptions.OperationalError: (1045, “访问被拒绝用户 'hp'@'localhost'使用密码：NO”

如何解决MySQLdb._exceptions.OperationalError: (1045, “访问被拒绝用户 'hp'@'localhost'使用密码：NO”

我正在使用 Flask 制作一个办公室管理系统，而且我是新手。我收到这个错误，我不知道为什么会发生。我检查了 db.yaml 文件中的数据，没问题。有人能帮我克服这个错误吗。

app.py

GuildManager

输出

from flask import Flask,render_template,request
from flask_MysqLdb import MysqL
import yaml

app = Flask(__name__)

db = yaml.safe_load(open('db.yaml'))
app.config['MysqL_HOST'] = db['MysqL_host']
app.config['MysqL_USER'] = db['MysqL_user']
app.config['MysqL_PASSWORD'] = db['MysqL_password']
app.config['MysqL_DB'] = db['MysqL_db']

MysqL = MysqL(app)

@app.route('/')
def output():
    return db['MysqL_db']

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

@app.route('/log_in/<string:name>',methods=['GET','POST'])
def manager_log_in(name):
    if request.method == 'POST':
        # Fetching HTML Data
        userDetails = request.form
        username = userDetails['username']
        password = userDetails['password']
        # Fetching Database Data
        cur = MysqL.connect.cursor()
        cur.execute(f"SELECT * FROM {name};")
        data = cur.fetchall()

        username_exists = False
        if username in data[:]['username']:
            username_exists = True

        password_matches = False
        cur.execute(f"SELECT password FROM {name} WHERE username = {username};")
        actual_password = cur.fetchall()
        actual_password = actual_password[0]['password']
        if actual_password == password:
            password_matches = True

        if username_exists and password_matches:
            return 'LOGGED IN SUCCESSFULLY'
        else:
            return 'INCORRECT USERNAME OR PASSWORD'

    return render_template('log_in.html',name=name.capitalize())

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

log_in.html

MysqLdb._exceptions.OperationalError: (1045,"Access denied for user 'hp'@'localhost' (using password: NO)")

我附上了可能发生错误的代码文件。