how to install python package? _ ModuleNotFoundError:

 

# 👇️ in a virtual environment or using Python 2
pip install Flask

# 👇️ for python 3 (could also be pip3.10 depending on your version)
pip3 install Flask

# 👇️ if you get permissions error
sudo pip3 install Flask
pip install Flask --user

# 👇️ if you don't have pip in your PATH environment variable
python -m pip install Flask

# 👇️ for python 3 (could also be pip3.10 depending on your version)
python3 -m pip install Flask

# 👇️ using py alias (Windows)
py -m pip install Flask

# 👇️ for Anaconda
conda install -c anaconda flask

# 👇️ for Jupyter Notebook
!pip install Flask

　　

 

 

 安装特定版本 python

 

 

 安装之后， 针对特定版本 安装特定版本的包

py -3.7 -m pip install numpy==1.21.5

 

 

 以特定版本的python 运行代码：

py -3.7 -m  test.py

 

 

 

参考：

ModuleNotFoundError: No module named 'flask' in Python | bobbyhadz