sqlalchemy 和 flask_sqlalchemy 无法导入 也试过重新安装，但还是报错：
Traceback (most recent call last):
File “d:\fisher\app\models\test.py”, line 1, in
import sqlalchemy
ModuleNotFoundError: No module named ‘sqlalchemy’

（是因为现在版本太新了么）

附上PowerShell：

PS D:\fisher> pipenv graph
cymysql0.9.18
Flask-SQLAlchemy2.5.1

• Flask [required: >=0.10, installed: 2.0.1]
  • click [required: >=7.1.2, installed: 8.0.1]
    • colorama [required: Any, installed: 0.4.4]
  • itsdangerous [required: >=2.0, installed: 2.0.1]
  • Jinja2 [required: >=3.0, installed: 3.0.1]
    • MarkupSafe [required: >=2.0, installed: 2.0.1]
  • Werkzeug [required: >=2.0, installed: 2.0.1]
• SQLAlchemy [required: >=0.8.0, installed: 1.4.23]
  • greenlet [required: !=0.4.17, installed: 1.1.1]
    mysql==0.0.3
• mysqlclient [required: Any, installed: 2.0.3]
  requests==2.26.0
• certifi [required: >=2017.4.17, installed: 2021.5.30]
• charset-normalizer [required: ~=2.0.0, installed: 2.0.4]
• idna [required: >=2.5,<4, installed: 3.2]
• urllib3 [required: >=1.21.1,<1.27, installed: 1.26.6]
  WTForms==2.3.3
• MarkupSafe [required: Any, installed: 2.0.1]