我已经安装了 sklearn，但是当我运行导入 sklearn 的 python 文件时，我得到以下信息：
Traceback (most recent call last):
File "first.py", line 3, in <module>
from sklearn import datasets
ModuleNotFoundError: No module named 'sklearn'
这是我安装sklearn时的结果：
Requirement already satisfied: scikit-learn in c:\users\user\appdata\local\programs\python\python38\lib\site-packages (0.24.0)
Requirement already satisfied: numpy>=1.13.3 in c:\users\user\appdata\local\programs\python\python38\lib\site-packages (from scikit-learn) (1.19.4)
Requirement already satisfied: scipy>=0.19.1 in c:\users\user\appdata\local\programs\python\python38\lib\site-packages (from scikit-learn) (1.5.4)
Requirement already satisfied: threadpoolctl>=2.0.0 in c:\users\user\appdata\local\programs\python\python38\lib\site-packages (from scikit-learn) (2.1.0)
Requirement already satisfied: joblib>=0.11 in c:\users\user\appdata\local\programs\python\python38\lib\site-packages (from scikit-learn) (1.0.0)