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PyPy is an alternate implementation of the Python 2.7, 3.9 and 3.10 interpreters. PyPy's benefits are in the area of speed, memory usage, sandboxing and stacklessness. It is compatible with CPython with some exceptions. PyPy also can be used to compile RPython programs to C code.

## Installation

For Python 2.7, install the pypy package. For Python 3.10, install the pypy3 package.

PyPy is installed in `/opt/pypy/` or `/opt/pypy3` and the main pypy executable is `bin/pypy-c`.

## Usage

Basic PyPy usage is done through the `pypy` or `pypy3` command and functions similarly to CPython usage. Enter

    $ pypy -h

to view the listing of `pypy` options.

### Interactive interpreter

To load the PyPy interactive interpreter, run

    $ pypy

### Run program from file

To run a Python program from a file in PyPy, run

    $ pypy example.py

### Virtual environment creation

To make a virtual environment with PyPy:

    $ virtualenv --python=/usr/bin/pypy venv-pypy

See Python/Virtual environment for further information.

### Installing pip

As Python packages for PyPy are not distributed as Arch packages, it is most convenient to install what you require as your own user:

    $ pypy -m ensurepip --user
    $ pypy -m pip install --user --upgrade pip

Once you have pip, you can install any package you need, e.g., `sqlalchemy`:

    $ pypy -m pip install --user sqlalchemy

If you would prefer to install packages system-wide, just run the previous commands as root without the `--user`. Note that this will result in the packages being installed in `/opt/pypy` without the package manager being aware of them.

## EasyInstall

Python libraries and programs can be installed in PyPy through EasyInstall.

### EasyInstall installation

EasyInstall does not come with the PyPy package but is automatically installed when installing pip and located at `/opt/pypy/bin/easy_install`.

### Installing EasyInstall packages

To install the EasyInstall package `package_name` into PyPy, enter

    # /opt/pypy/bin/easy_install package_name

Packages will be located at `/opt/pypy/site-packages`. Installed libraries and applications will be at `/opt/pypy/bin`. Programs installed through EasyInstall on PyPy can usually be ran with `/opt/pypy/bin/program_name` where program_name is the name of the PyPy program.

### EasyInstall package example

The following will install the Lamson email framework:

    # /opt/pypy/bin/easy_install lamson

The following will run the framework's `gen -project` command:

    $ /opt/pypy/bin/lamson gen -project testproject

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