使用pycharm社区版和mysql完成一个数据集管理系统。先生成两个随机数据集，要求实现:(1)针对每个数据集要有详情页可以展示出具体描述信息，并可提供下载，并用折线图显示下载量。(2)数据集上可以添加，评论，有点赞和踩;用户也可以取消点赞，可以删除自己的评论。首页展示关注度最高或者下载量最大的数据集，并用html在网页中显示，请显示完整代码

首先，需要安装PyMySQL和Matplotlib库，可以使用以下命令进行安装：

pip install PyMySQL
pip install matplotlib

接着，需要在MySQL中创建一个数据库和两个数据表，分别存储数据集和评论信息。可以使用以下SQL语句：

CREATE DATABASE dataset_manager;

USE dataset_manager;

CREATE TABLE datasets (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    description TEXT,
    download_count INT DEFAULT 0
);

CREATE TABLE comments (
    id INT AUTO_INCREMENT PRIMARY KEY,
    dataset_id INT NOT NULL,
    user_name VARCHAR(255) NOT NULL,
    content TEXT,
    like_count INT DEFAULT 0,
    dislike_count INT DEFAULT 0,
    FOREIGN KEY (dataset_id) REFERENCES datasets(id) ON DELETE CASCADE
);

然后，可以编写Python代码实现数据集管理系统。以下是完整代码：

from flask import Flask, render_template, request, redirect, url_for
import pymysql
import matplotlib.pyplot as plt

app = Flask(__name__)

# MySQL连接配置
host = 'localhost'
port = 3306
user = 'root'
password = 'password'
database = 'dataset_manager'
conn = pymysql.connect(host=host, port=port, user=user, password=password, database=database)

# 随机生成两个数据集
with conn.cursor() as cursor:
    cursor.execute("INSERT INTO datasets (name, description) VALUES ('Dataset A', 'Description for Dataset A')")
    cursor.execute("INSERT INTO datasets (name, description) VALUES ('Dataset B', 'Description for Dataset B')")
    conn.commit()

# 主页
@app.route('/')
def index():
    # 获取关注度最高或下载量最大的数据集
    with conn.cursor() as cursor:
        cursor.execute("SELECT * FROM datasets ORDER BY download_count DESC LIMIT 1")
        dataset = cursor.fetchone()
    # 获取评论信息
    with conn.cursor() as cursor:
        cursor.execute("SELECT * FROM comments WHERE dataset_id = %s ORDER BY like_count DESC, dislike_count ASC", dataset['id'])
        comments = cursor.fetchall()
    return render_template('index.html', dataset=dataset, comments=comments)

# 数据集详情页
@app.route('/dataset/<int:dataset_id>')
def dataset_detail(dataset_id):
    # 获取数据集信息
    with conn.cursor() as cursor:
        cursor.execute("SELECT * FROM datasets WHERE id = %s", dataset_id)
        dataset = cursor.fetchone()
    # 获取评论信息
    with conn.cursor() as cursor:
        cursor.execute("SELECT * FROM comments WHERE dataset_id = %s ORDER BY like_count DESC, dislike_count ASC", dataset_id)
        comments = cursor.fetchall()
    return render_template('dataset_detail.html', dataset=dataset, comments=comments)

# 添加评论
@app.route('/dataset/<int:dataset_id>/add_comment', methods=['POST'])
def add_comment(dataset_id):
    user_name = request.form['user_name']
    content = request.form['content']
    with conn.cursor() as cursor:
        cursor.execute("INSERT INTO comments (dataset_id, user_name, content) VALUES (%s, %s, %s)", (dataset_id, user_name, content))
        conn.commit()
    return redirect(url_for('dataset_detail', dataset_id=dataset_id))

# 点赞评论
@app.route('/comment/<int:comment_id>/like', methods=['POST'])
def like_comment(comment_id):
    with conn.cursor() as cursor:
        cursor.execute("UPDATE comments SET like_count = like_count + 1 WHERE id = %s", comment_id)
        conn.commit()
    return redirect(request.referrer)

# 踩评论
@app.route('/comment/<int:comment_id>/dislike', methods=['POST'])
def dislike_comment(comment_id):
    with conn.cursor() as cursor:
        cursor.execute("UPDATE comments SET dislike_count = dislike_count + 1 WHERE id = %s", comment_id)
        conn.commit()
    return redirect(request.referrer)

# 删除评论
@app.route('/comment/<int:comment_id>/delete', methods=['POST'])
def delete_comment(comment_id):
    with conn.cursor() as cursor:
        cursor.execute("DELETE FROM comments WHERE id = %s", comment_id)
        conn.commit()
    return redirect(request.referrer)

# 下载数据集
@app.route('/dataset/<int:dataset_id>/download', methods=['POST'])
def download_dataset(dataset_id):
    with conn.cursor() as cursor:
        cursor.execute("UPDATE datasets SET download_count = download_count + 1 WHERE id = %s", dataset_id)
        conn.commit()
    return redirect(request.referrer)

# 折线图展示下载量
@app.route('/dataset/<int:dataset_id>/download_chart')
def download_chart(dataset_id):
    with conn.cursor() as cursor:
        cursor.execute("SELECT * FROM datasets WHERE id = %s", dataset_id)
        dataset = cursor.fetchone()
        cursor.execute("SELECT COUNT(*) as count, DATE_FORMAT(created_at, '%%Y-%%m-%%d') as date FROM downloads WHERE dataset_id = %s GROUP BY date", dataset_id)
        data = cursor.fetchall()
    x = [d['date'] for d in data]
    y = [d['count'] for d in data]
    plt.plot(x, y)
    plt.title('Download Count for {}'.format(dataset['name']))
    plt.xlabel('Date')
    plt.ylabel('Download Count')
    plt.savefig('download_count.png')
    return render_template('download_chart.html', dataset=dataset)

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

接下来，需要在templates文件夹中创建两个HTML模板文件：index.html和dataset_detail.html。以下是模板文件的代码：

index.html：

<!DOCTYPE html>
<html>
<head>
    <title>Dataset Manager</title>
</head>
<body>
    <h1>Dataset Manager</h1>
    <h2>Most Popular Dataset</h2>
    <h3>{{ dataset.name }}</h3>
    <p>{{ dataset.description }}</p>
    <p>Download Count: {{ dataset.download_count }}</p>
    <form action="{{ url_for('download_dataset', dataset_id=dataset.id) }}" method="POST">
        <button type="submit">Download</button>
    </form>
    <h2>Comments</h2>
    <ul>
        {% for comment in comments %}
        <li>
            <p><strong>{{ comment.user_name }}</strong> - {{ comment.content }}</p>
            <p>Like: {{ comment.like_count }} / Dislike: {{ comment.dislike_count }}</p>
            <form action="{{ url_for('like_comment', comment_id=comment.id) }}" method="POST">
                <button type="submit">Like</button>
            </form>
            <form action="{{ url_for('dislike_comment', comment_id=comment.id) }}" method="POST">
                <button type="submit">Dislike</button>
            </form>
            {% if comment.user_name == 'admin' %}
            <form action="{{ url_for('delete_comment', comment_id=comment.id) }}" method="POST">
                <button type="submit">Delete</button>
            </form>
            {% endif %}
        </li>
        {% endfor %}
    </ul>
    <form action="{{ url_for('add_comment', dataset_id=dataset.id) }}" method="POST">
        <label for="user_name">Name:</label>
        <input type="text" id="user_name" name="user_name"><br>
        <label for="content">Comment:</label>
        <textarea id="content" name="content"></textarea><br>
        <button type="submit">Submit</button>
    </form>
    <form action="{{ url_for('download_chart', dataset_id=dataset.id) }}" method="GET">
        <button type="submit">Show Download Chart</button>
    </form>
</body>
</html>

dataset_detail.html：

<!DOCTYPE html>
<html>
<head>
    <title>Dataset Manager - {{ dataset.name }}</title>
</head>
<body>
    <h1>{{ dataset.name }}</h1>
    <p>{{ dataset.description }}</p>
    <p>Download Count: {{ dataset.download_count }}</p>
    <form action="{{ url_for('download_dataset', dataset_id=dataset.id) }}" method="POST">
        <button type="submit">Download</button>
    </form>
    <h2>Comments</h2>
    <ul>
        {% for comment in comments %}
        <li>
            <p><strong>{{ comment.user_name }}</strong> - {{ comment.content }}</p>
            <p>Like: {{ comment.like_count }} / Dislike: {{ comment.dislike_count }}</p>
            <form action="{{ url_for('like_comment', comment_id=comment.id) }}" method="POST">
                <button type="submit">Like</button>
            </form>
            <form action="{{ url_for('dislike_comment', comment_id=comment.id) }}" method="POST">
                <button type="submit">Dislike</button>
            </form>
            {% if comment.user_name == 'admin' %}
            <form action="{{ url_for('delete_comment', comment_id=comment.id) }}" method="POST">
                <button type="submit">Delete</button>
            </form>
            {% endif %}
        </li>
        {% endfor %}
    </ul>
    <form action="{{ url_for('add_comment', dataset_id=dataset.id) }}" method="POST">
        <label for="user_name">Name:</label>
        <input type="text" id="user_name" name="user_name"><br>
        <label for="content">Comment:</label>
        <textarea id="content" name="content"></textarea><br>
        <button type="submit">Submit</button>
    </form>
    <form action="{{ url_for('download_chart', dataset_id=dataset.id) }}" method="GET">
        <button type="submit">Show Download Chart</button>
    </form>
</body>
</html>

最后，需要在static文件夹中添加一个download_count.png文件，用于展示折线图。

现在，可以运行Python代码，并访问http://localhost:5000/来查看数据集管理系统。