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To create a virtual environment (venv) using Python 3.11 while your system has Python 3.13 installed, follow these steps:

🛠️ Step-by-Step Instructions

1️⃣ Check Installed Python Versions

First, confirm that Python 3.11 is installed on your system.

Run this command:

python3 --version

or

python --version

If it returns Python 3.13, you need to check if Python 3.11 is available.

👉 Windows:

List available Python versions:

py --list

If Python 3.11 appears, use py -3.11 instead of python.

👉 macOS/Linux:

List installed Python versions:

ls /usr/bin/python*

If you see /usr/bin/python3.11, you can use python3.11 instead of python.

2️⃣ Create a Virtual Environment Using Python 3.11

Run one of the following commands depending on your OS:

👉 Windows (PowerShell / CMD)

py -3.11 -m venv myenv

or (if py -3.11 does not work)

C:\Path\To\Python311\python.exe -m venv myenv

👉 macOS/Linux

python3.11 -m venv myenv

or (if python3.11 is not recognized)

/usr/bin/python3.11 -m venv myenv

This will create a virtual environment named myenv.

3️⃣ Activate the Virtual Environment

Once the virtual environment is created, activate it:

👉 Windows (PowerShell)

myenv\Scripts\Activate

👉 Windows (CMD)

myenv\Scripts\activate.bat

👉 macOS/Linux

source myenv/bin/activate

After activation, your terminal should show something like:

(myenv) user@computer:~$

4️⃣ Install PyTorch for Python 3.11

Now that you have the virtual environment, install PyTorch:

👉 For CPU (No CUDA)

pip install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cpu

👉 For GPU (CUDA 11.8)

pip install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cu118

5️⃣ Verify the Installation

Run Python inside your virtual environment:

python

Then, test if PyTorch is installed correctly:

import torch
print(torch.__version__)
print(torch.cuda.is_available())  # Should return True if GPU is available

6️⃣ Use the Virtual Environment

Now, whenever you need to run your project, activate the environment first:

source myenv/bin/activate  # macOS/Linux
myenv\Scripts\Activate      # Windows (PowerShell)

To deactivate the environment, simply run:

deactivate

✅ Summary

1️⃣ Ensure Python 3.11 is installed.
2️⃣ Create a virtual environment:

• Windows: py -3.11 -m venv myenv
• macOS/Linux: python3.11 -m venv myenv
  3️⃣ Activate the environment.
  4️⃣ Install PyTorch using pip.
  5️⃣ Verify the installation.
  6️⃣ Use source myenv/bin/activate (or myenv\Scripts\Activate on Windows) to activate it when needed.

Now your environment is set up with Python 3.11 and PyTorch! 🚀