Viv

viv isn't venv

See usage for more demo gifs.

Python is a great choice to quickly prototype or accomplish small tasks in scripts. However, leveraging it's vast ecosystem can be tedious for one-off or rarely used scripts. This is were viv comes in handy.

Viv is a standalone dependency-free venv creator. It is meant to be invoked in any script that has third-party dependencies, prior to loading of any of the external modules.

These venvs can be identified by name or by their specification. In any case they will be re-used across scripts (and generated on-demand, if needed).

Importantly, viv will remove your user site directory (python -m 'import site;print(site.USER_SITE)'), to ensure the script isn't using anything outside the standard library and the viv-managed venv.

Setup

Manual (Recommended)

Start by cloning the repo and symlinking the script for access to the CLI. By default it will symlink ./src/viv/viv.py to ~/bin/viv. You can set PREFIX to symlink to a different location.

git clone git@github.com:daylinmorgan/viv.git ~/.viv
cd ~/.viv
make install # or PREFIX=~/.local/bin make install

Place this directory on the python path in your rc file.

export PYTHONPATH="$PYTHONPATH:$HOME/.viv/src"

Advanced users may recognize that principally, the module just needs to be recognized at run time and the single script at ./src/viv/viv.py can be invoked directly for the CLI. How you accomplish these options is ultimately up to you but the above instructions can get you started.

Pypi (Not Recommended)

pip install viv

Why is this not recommended? Mainly, because viv is all about hacking your sys.path. Placing it in it's own virtual environment or installing in a user site directory may complicate this endeavor.

Usage

In any python script with external dependencies you can add this line, to automate vivenv creation and installation of dependencies.

__import__("viv").activate("click")

To remove all vivenvs:

viv remove $(viv list -q)

Standalone Viv

Requires python>=3.8

Supposing you want to increase the portability of your script while still employing viv.

The below function can be freely pasted at the top of your scripts and requires no modification of your PYTHONPATH or import of additional modules (including downloading/installing viv).

It can be auto-generated with for example: viv freeze <spec> --standalone.

The only part necessary to modify if copied verbatim from below is the call to _viv_activate.

output of viv freeze rich --standalone:

# <<<<< auto-generated by daylinmorgan/viv (v.22.12a3)
# fmt: off
def _viv_activate(*pkgs: str, track_exe: bool = False, name: str = "") -> None:                               # noqa
    i,s,m,e,spec=__import__,str,map,lambda x: True if x else False,[*pkgs]                                    # noqa
    if not {*m(type,pkgs)}=={s}: raise ValueError(f"spec: {pkgs} is invalid")                                 # noqa
    ge,sys,P,ew=i("os").getenv,i("sys"),i("pathlib").Path,i("sys").stderr.write                               # noqa
    (cache:=(P(ge("XDG_CACHE_HOME",P.home()/".cache"))/"viv"/"venvs")).mkdir(parents=True,exist_ok=True)      # noqa
    ((sha256:=i("hashlib").sha256()).update((s(spec)+                                                         # noqa
     (((exe:=("N/A",s(P(i("sys").executable).resolve()))[e(track_exe)])))).encode()))                         # noqa
    if (env:=cache/(name if name else (_id:=sha256.hexdigest()))) not in cache.glob("*/") or ge("VIV_FORCE"): # noqa
        v=e(ge("VIV_VERBOSE"));ew(f"generating new vivenv -> {env.name}\n")                                   # noqa
        i("venv").EnvBuilder(with_pip=True,clear=True).create(env)                                            # noqa
        with (env/"pip.conf").open("w") as f:f.write("[global]\ndisable-pip-version-check=true")              # noqa
        if (p:=i("subprocess").run([env/"bin"/"pip","install","--force-reinstall",*spec],text=True,           # noqa
            stdout=(-1,None)[v],stderr=(-2,None)[v])).returncode!=0:                                          # noqa
            if env.is_dir():i("shutil").rmtree(env)                                                           # noqa
            ew(f"pip had non zero exit ({p.returncode})\n{p.stdout}\n");sys.exit(p.returncode)                # noqa
        with (env/"viv-info.json").open("w") as f:                                                            # noqa
            i("json").dump({"created":s(i("datetime").datetime.today()),"id":_id,"spec":spec,"exe":exe},f)    # noqa
    sys.path = [p for p in (*sys.path,s(*(env/"lib").glob("py*/si*"))) if p!=i("site").USER_SITE]             # noqa
_viv_activate("markdown-it-py==2.2.0", "mdurl==0.1.2", "Pygments==2.14.0", "rich==13.3.2")                    # noqa
# fmt: on
# >>>>> code golfed with <3

Alternatives

pip-run

pip-run (10.0.5)
├── autocommand (2.2.2)
├── jaraco-context (4.3.0)
├── jaraco-functools (3.6.0)
│   └── more-itertools (9.1.0)
├── jaraco-text (3.11.1)
│   ├── autocommand (2.2.2)
│   ├── inflect (6.0.2)
│   │   └── pydantic>=1.9.1 (1.10.5)
│   │       └── typing-extensions>=4.2.0 (4.5.0)
│   ├── jaraco-context>=4.1 (4.3.0)
│   ├── jaraco-functools (3.6.0)
│   │   └── more-itertools (9.1.0)
│   └── more-itertools (9.1.0)
├── more-itertools>=8.3 (9.1.0)
├── packaging (23.0)
├── path>=15.1 (16.6.0)
├── pip>=19.3 (23.0.1)
└── platformdirs (3.1.0)

pipx

pipx (1.1.0)
├── argcomplete>=1.9.4 (2.1.1)
├── packaging>=20.0 (23.0)
└── userpath>=1.6.0 (1.8.0)
    └── click (8.1.3)

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Viv