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Python virtual environment setup

Table of Contents

Virtual Environment using CMD

where python

  • Gives the path of the python installation

Basic pip

pip help

  • Displays a summary of pip commands

pip help [specific-command]

  • Displays details for the command

pip list

  • Displays list of all python packages installed

Creating virtual environment

  1. Step 01: Change directory to project folder
  2. Step 02: Create virtual environment
  3. Step 03: Activate it
  4. Step 04: Install required packages
  5. Step 05: Save installed packages or deactivate it

Using cmd commands, go to the project folder, where you need to create virtual environment and then write the following

python -m venv env-name
python -m venv env-name --system-site-packages

--system-site-packages gives access to the system site-packages directory [all system packages]

Then, you need to activate the newly created virtual environment env-name by

env-name\Scripts\activate.bat

Update the pip in the virtual environment:

python -m pip install --upgrade pip

Now, if you install packages using pip, all the packages will be installed only in the virtual environment env-name.

To deactivate the current virtual environment, just write the following

deactivate

pip freeze prints the list of all python packages installed with their version

You can manually copy the output and make a requirements.txt file. So that you can recreate the same environment on a different location or another device.

You can automate the task by the following command

pip freeze > requirements.txt

To recreate the same environment, at first create a new virtual environment, activate it and run the following

pip install -r requirements.txt

With specific python version

Run venv with a specific python version. You can run using the full path where python is installed.

"C:\Program Files\Python38\python.exe" -m venv venv38

Virtual Environment using VS Code

We can create a virtual environment similar way explained above using cmd.

To select a specific python interpreter,

  1. We need to click Ctrl + P and then type > or Ctrl + Shift+ P
  2. Click Python: Select Interpreter
  3. Select an interpreter displayed or click + Enter interpreter path... and nagivate to the python.exe file of a specific virtual environment

References

Python Tutorial: VENV (Windows) - How to Use Virtual Environments with the Built-In venv Module