I installed via powershell with "Invoke-WebRequest -UseBasicParsing -Uri "https://raw.githubusercontent.com/pyenv-win/pyenv-win/master/pyenv-win/install-pyenv-win.ps1" -OutFile "./install-pyenv-win.ps1"; &"./install-pyenv-win.ps1" to install pyenv-win. I want to use it to create a virtual environment with an earlier version of python. Can you give me steps? Also do I need to invoke pyenv everytime I open the virtual environment?
user
Sure, I'd be happy to help you get started with using pyenv to create a virtual environment with an earlier version of Python. Once you have pyenv installed, follow these steps:

1. List all installed Python versions:

```powershell
pyenv versions
```

2. Create a virtual environment for a specific Python version:

```powershell
pyenv virtualenv2 2.7.16 MyEnv
```

- This command creates a virtual environment called "MyEnv" for Python 2.7.16. Replace "2.7.16" with the version number of the Python you want to use.

3. Activate the environment:

```powershell
activate MyEnv
```

- This command activates your newly created virtual environment.

4. Verify that you are in the correct environment using the `which` command:

```powershell
which python
```

- This should output the path to the Python installation in your virtual environment.

As for your second question, you do not need to invoke pyenv every time you open a virtual environment. You only need to invoke it once, during the creation/activation process:

- When creating a new virtual environment: `pyenv virtualenv MyEnv py3.8`
- When activating an existing virtual environment: `pyenv activate MyEnv`

Once you've activated your environment, you can work with Python as usual, without needing to invoke pyenv again.
assistant
I installed via powershell with "Invoke-WebRequest -UseBasicParsing -Uri "https://raw.githubusercontent.com/pyenv-win/pyenv-win/master/pyenv-win/install-pyenv-win.ps1" -OutFile "./install-pyenv-win.ps1"; &"./install-pyenv-win.ps1" to install pyenv-win. I want to use it to create a virtual environment with an earlier version of python. Can you give me steps? Also do I need to invoke pyenv everytime I open the virtual environment?
user
Sure, here are the steps to create a virtual environment using pyenv-win:

1. First, you need to install the earlier version of Python that you want to use. You can do this with the `pyenv install` command. For example, if you want to install Python 3.6.8, you would use the command `pyenv install 3.6.8`. This will download and install Python 3.6.8 on your system.

2. Once the earlier version of Python is installed, you can set it as the local version for your project. Navigate to your project directory and run the command `pyenv local 3.6.8` (replace 3.6.8 with the version you installed).

3. Now, you can create a virtual environment. Python 3.3 and later versions come with the `venv` module standard, which you can use to create virtual environments. In your project directory, run the command `python -m venv env` (replace 'env' with the name you want to give your virtual environment).

4. To activate the virtual environment, run the command `.\env\Scripts\activate` (replace 'env' with the name of your virtual environment). Your command prompt should change to indicate that you are now operating within a Python virtual environment. It will look something like this: `(env) C:\path\to\your\project>`.

As for your second question, you do not need to invoke pyenv every time you open the virtual environment. Once you've set the local version with `pyenv local`, pyenv will automatically use that version of Python whenever you're working in that directory. However, you will need to activate the virtual environment every time you start a new command prompt session. You can do this by navigating to your project directory and running the activate command again (`.\env\Scripts\activate`).
assistant