Setting up Flask Locally

1. Open the command line with administrator privileges.
2. Use pip to install virtualenv on Windows:

py -2 -m pip install virtualenv
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1. Make a separate directory for your project:

mkdir <project name>
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2. Move into the directory:

cd <project name>
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3. Within the directory, create the virtual environment for Flask. When you create the environment, a new folder appears in your project directory with the environment’s name.

• For Python 3:
  Create and name a virtual environment in Python 3 with:

py -3 -m venv <name of environment>
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Install Flask within the activated environment using pip:

pip install Flask
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Set the FLASK_APP environment variable.

• For Windows:

setx FLASK_APP "app.py"
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flask run
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https://phoenixnap.com/kb/install-flask