Python Flask Jinja2如果语句总是计算为false&

我正在我的网站上实现一个管理页面，但即使我输入了正确的凭据，它仍然说"没有访问"

app.py:

@app.route('/login')
def login():
    return render_template('login.html', incorrect=False)

@app.route('/login', methods=['POST'])
def login_post():
    creds = dict(request.form)
    if creds['username'] == USERNAME and creds['password'] == PASSWORD:
        return redirect(url_for('admin', authenticated=1))
    else:
        return render_template('login.html', incorrect=True)

@app.route('/admin')
def admin(authenticated=0):
    conn = sqlite3.connect('articles.db')
    cur = conn.cursor()
    cur.execute("SELECT * FROM PENDING")
    articles = cur.fetchall()
    #print(articles)
    conn.close()
    return render_template('admin.html', authenticated=authenticated, articles=articles)

注意:凭证都是admin(设置在. inf文件中)

Login.html:

{% extends "base.html" %}

{% block title %}Login{% endblock %}
{% block content %}
<div class="write container py-3 mx-auto bg-muted text-white" style="width: 60vw;">
    <h1 action="{{ url_for('write_post') }}" data-aos="fade-up">Admin Login</h1>
    {% if incorrect %}
        <div class="alert alert-danger alert-dismissible">
            <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
            <strong>Incorrect Credentials</strong> Please try again.
        </div>
    {% endif %}
    <form method="POST" enctype=multipart/form-data>
        <label data-aos="fade-up" data-aos-delay="50" for="username">Username:</label><br>
            <input data-aos="fade-up" data-aos-delay="100" required maxlength="255" id="username" name="username"><br><br>
        <label data-aos="fade-up" data-aos-delay="150" for="password">Password:</label><br>
            <input data-aos="fade-up" data-aos-delay="200" required maxlength="255" id="password" name="password"><br><br>
        <input data-aos="fade-up" data-aos-delay="450" class="btn btn-success" type="submit">
    </form>
</div>
{% endblock %}

admin.html:

{% extends "base.html" %}

{% block title %}Admin{% endblock %}

{% block content %}
{% if authenticated %}
<div data-aos="fade-down" class=".container p-5 bg-muted text-white">
    <h1>Articles pending review: </h1>
</div>
{% else %}
<div data-aos="fade-down" class=".container p-5 bg-muted text-white">
    <h1>No Access</h1>
    <p>You are not logged in!</p>
</div>
{% endif %}
{% endblock %}

在www.example.com中，即使我通过了1，admin.html中的if authenticated计算为false. 网址是http://127.0.0.1:5001/admin?authenticated=1 flask服务器运行时使用flask run --debug --port 5001 我该如何解决这个问题，并显示管理页面的内容，如果登录？