Python Flask Virtual Environment Create

Flask is a web framework that provides libraries to build lightweight web applications in python.

Install Virtual Environment:

• virtualenv is considered as the virtual python environment builder which is used to create the multiple python virtual environment side by side.

• At first open Visual Studio Code then use following command to install virtual environment:

  • pip install virtualenv

• Once it is installed, we can create the new virtual environment into a folder as given below.

  • python -m venv env

• To activate the corresponding environment, use the following command on the Windows operating system.

  • .\env\Scripts\activate

• If your pip is not upgraded then upgrade the pip:

  • python -m pip install --upgrade pip

• Now install the flask by using the following command:

  • pip install flask

• After installation now create a first Flask application. Create this application outside the env folder.Like- app.py, you can use any types of name. Write the following lines of code to check the application.

from flask import Flask
app = Flask (__name__)

@app.route("/")
def home():
  return "Hello world"
if __name__ == "__main__":
  app.run(debug=True) 

• For run this code Select Interpreter press Ctrl+Shipt+P. Then select env interpreter. Like this type- Python 3.10.10('env':venv).\env\Script\python.exe
• Let's run this python code using this command:
  • python -m flask run
• To show this output on web browser ctrl+click the following lines in your terminal: Running on http://127.0.0.1:5000