ModuleNotFoundError: No module named 'MySQLdb'

老师，我在虚拟环境下终端运行python manage.py db migrate后，程序没有去我D盘的虚拟环境里找包，而是去C盘的原生python里找包，导致好多包ModuleNotFoundError，有什么办法可以让manage.py去我的虚拟环境找包吗？

相关代码：

from flask_migrate import Migrate, MigrateCommand
from flask_script import Manager

from app import app
from app import db

manager = Manager(app)
# 1.要使用flask-migrate，必须先绑定db和app
migrate = Migrate(app, db)

# 2.把migrateCommand命令添加到manager中。
manager.add_command('db', MigrateCommand)

if __name__ == "__main__":
    manager.run()

相关代码：

Microsoft Windows [版本 10.0.19042.928]
(c) Microsoft Corporation。保留所有权利。

(venv) D:\ITrelated\lab_wiki_test>python manage.py db migrate
C:\Python\lib\site-packages\flask_sqlalchemy\__init__.py:873: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the futur
e.  Set it to True or False to suppress this warning.
  'SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and '
Traceback (most recent call last):
  File "manage.py", line 16, in <module>
    manager.run()
  File "C:\Python\lib\site-packages\flask_script\__init__.py", line 417, in run
    result = self.handle(argv[0], argv[1:])
  File "C:\Python\lib\site-packages\flask_script\__init__.py", line 386, in handle
    res = handle(*args, **config)
  File "C:\Python\lib\site-packages\flask_script\commands.py", line 216, in __call__
    return self.run(*args, **kwargs)
  File "C:\Python\lib\site-packages\flask_migrate\__init__.py", line 96, in wrapped
    f(*args, **kwargs)
  File "C:\Python\lib\site-packages\flask_migrate\__init__.py", line 212, in migrate
    version_path=version_path, rev_id=rev_id)
  File "C:\Python\lib\site-packages\alembic\command.py", line 212, in revision
    script_directory.run_env()
  File "C:\Python\lib\site-packages\alembic\script\base.py", line 490, in run_env
    util.load_python_file(self.dir, "env.py")
  File "C:\Python\lib\site-packages\alembic\util\pyfiles.py", line 97, in load_python_file
    module = load_module_py(module_id, path)
  File "C:\Python\lib\site-packages\alembic\util\compat.py", line 182, in load_module_py
    spec.loader.exec_module(module)
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "migrations\env.py", line 25, in <module>
    str(current_app.extensions['migrate'].db.engine.url).replace('%', '%%'))
  File "C:\Python\lib\site-packages\flask_sqlalchemy\__init__.py", line 998, in engine
    return self.get_engine()
  File "C:\Python\lib\site-packages\flask_sqlalchemy\__init__.py", line 1017, in get_engine
    return connector.get_engine()
  File "C:\Python\lib\site-packages\flask_sqlalchemy\__init__.py", line 594, in get_engine
    self._engine = rv = self._sa.create_engine(sa_url, options)
  File "C:\Python\lib\site-packages\flask_sqlalchemy\__init__.py", line 1027, in create_engine
    return sqlalchemy.create_engine(sa_url, **engine_opts)
  File "<string>", line 2, in create_engine
  File "C:\Python\lib\site-packages\sqlalchemy\util\deprecations.py", line 298, in warned
    return fn(*args, **kwargs)
  File "C:\Python\lib\site-packages\sqlalchemy\engine\create.py", line 548, in create_engine
    dbapi = dialect_cls.dbapi(**dbapi_args)
  File "C:\Python\lib\site-packages\sqlalchemy\dialects\mysql\mysqldb.py", line 118, in dbapi
    return __import__("MySQLdb")
ModuleNotFoundError: No module named 'MySQLdb'

(venv) D:\ITrelated\lab_wiki_test>