input: Write a python function to automate the setup of a basic web server environment which includes installing Apache, setting up MySQL, copying HTML and CGI files, and configuring appropriate permissions.
  assert setup_web_server('index.html', 'my_cgi.py', 'my_conn.py')==None
output: import os
  import shutil
  import subprocess
  
  def setup_web_server(html_file, cgi_file, conn_file):
      # Update package lists
      subprocess.run(['sudo', 'apt-get', 'update'], check=True)
      
      # Install Apache
      subprocess.run(['sudo', 'apt-get', 'install', '-y', 'apache2'], check=True)
      
      # Install MySQL
      subprocess.run(['sudo', 'apt-get', 'install', '-y', 'mysql-server'], check=True)
      
      # Enable CGI module for Apache
      subprocess.run(['sudo', 'a2enmod', 'cgi'], check=True)
      
      # Restart Apache to apply changes
      subprocess.run(['sudo', 'systemctl', 'restart', 'apache2'], check=True)
      
      # Copy HTML file to Apache's root directory
      web_root = '/var/www/html'
      shutil.copy(html_file, os.path.join(web_root, html_file))
      
      # Copy CGI and connection files to CGI-bin directory
      cgi_bin = '/usr/lib/cgi-bin'
      shutil.copy(cgi_file, os.path.join(cgi_bin, cgi_file))
      shutil.copy(conn_file, os.path.join(cgi_bin, conn_file))
      
      # Set appropriate permissions
      subprocess.run(['sudo', 'chmod', '755', os.path.join(cgi_bin, cgi_file)], check=True)
      subprocess.run(['sudo', 'chmod', '755', os.path.join(cgi_bin, conn_file)], check=True)
      subprocess.run(['sudo', 'chown', 'www-data:www-data', os.path.join(web_root, html_file)], check=True)
      subprocess.run(['sudo', 'chown', 'www-data:www-data', os.path.join(cgi_bin, cgi_file)], check=True)
      subprocess.run(['sudo', 'chown', 'www-data:www-data', os.path.join(cgi_bin, conn_file)], check=True)