A fun party trick, via
uvand pickle, to run Python code from another venv ... into this one.
You can install this tool via:
uv pip install uvtrick
There are a few ways to use this library. The first one is to use the load function to point
to a Python script that contains the function you want to use. This function assumes that the
script carries inline script metadata.
from uvtrick import load
# Load the function `add` from the file `some_script.py`
# It runs in another virtualenv, but you get back the response via pickle.
# Be aware of the limitations, please only consider base Python objects.
add = load("some_script.py", "add")
# This result is from the `some_script.py` file, running in another virtualenv
# with `uv`. A pickle in a temporary file is used to communicate the result.
add(1, 2) # 3But you can also take it a step further and use the Env class to run a function in a specific environment.
from uvtrick import Env
# For illustration purposes, let's assume that rich is not part of the current environment.
# Also note that all the imports happen inside of this function.
def uses_rich():
from rich import print
from importlib import metadata
version = metadata.version("rich")
print(f"hello from rich=={version}")
# This runs the function `uses_rich` in a new environment with the `rich` package installed.
# Just like the `load` function before, the result is returned via pickle.
Env("rich", python="3.12").run(uses_rich)This approach is pretty useful if you are interested in running the same function in different versions of a dependency to spot a performance regression. You might be able to do that via something like:
from uvtrick import Env
def uses_rich(a, b):
from rich import print
from importlib import metadata
version = metadata.version("rich")
print(f"hello from rich=={version}")
return a + b
for version in (10, 11, 12, 13):
Env(f"rich=={version}", python="3.12").run(uses_rich, a=1, b=2)Be aware that a lot of pickling is happening under the hood here. This can be a problem if you are trying to pickle large objects
or if your function is returning an object that needs a dependency that is not installed in the environment that is calling Env.
Also note that thusfar this entire project is merely the result of a very entertaining recreational programming session. We might want to gather some community feedback before suggesting production usage.