/bin/sh: mysql_config: command not found

pip install -r requirements.txt install mysqlclient error under mac

```bash
Collecting mysqlclient==2.1.1 (from -r requirements.txt (line 17))
  Using cached mysqlclient-2.1.1.tar.gz (88 kB)
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error
  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [16 lines of output]
      /bin/sh: mysql_config: command not found
      /bin/sh: mariadb_config: command not found
      /bin/sh: mysql_config: command not found
      OSError: mysql_config not found
      mysql_config --version
      mariadb_config --version
      mysql_config --libs
      [end of output]

Main error message:

      /bin/sh: mysql_config: command not found
      /bin/sh: mariadb_config: command not found
      /bin/sh: mysql_config: command not found
      OSError: mysql_config not found

I installed mysql8.0. I entered mysql in the vscode terminal and it prompted that it could not be found.
After adding the mysql path, I tested it in the editor terminal.

 % PATH="$PATH":/usr/local/mysql/bin
 % mysql
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

The main reason is that the path cannot be recognized because the environment variable is not set