I'm looking for a good way to figure out the name of the conda environment I'm in from within running code or an interactive python instance.
The use-case is that I am running Jupyter notebooks with both Python 2 and Python 3 kernels from a miniconda install. The default environment is Py3. There is a separate environment for Py2. Inside the a notebook file, I want it to attempt to conda install foo
. I'm using subcommand
to do this for now, since I can't find a programmatic conda equivalent of pip.main(['install','foo'])
.
The problem is that the command needs to know the name of the Py2 environment to install foo
there if the notebook is running using the Py2 kernel. Without that info it installs in the default Py3 env. I'd like for the code to figure out which environment it is in and the right name for it on its own.
The best solution I've got so far is:
import sys def get_env(): sp = sys.path[1].split("/") if "envs" in sp: return sp[sp.index("envs") + 1] else: return ""
Is there a more direct/appropriate way to accomplish this?
Conda has a default environment called base that include a Python installation and some core system libraries and dependencies of Conda. It is a “best practice” to avoid installing additional packages into your base software environment.
All Installed Conda Environments are stored in your Block Volume in the /home/datascience/conda directory.
You want $CONDA_DEFAULT_ENV
or $CONDA_PREFIX
:
$ source activate my_env (my_env) $ echo $CONDA_DEFAULT_ENV my_env (my_env) $ echo $CONDA_PREFIX /Users/nhdaly/miniconda3/envs/my_env $ source deactivate $ echo $CONDA_DEFAULT_ENV # (not-defined) $ echo $CONDA_PREFIX # (not-defined)
In python:
In [1]: import os ...: print (os.environ['CONDA_DEFAULT_ENV']) ...: my_env
for the absolute entire path which is usually more useful:
Python 3.9.0 | packaged by conda-forge | (default, Oct 14 2020, 22:56:29) [Clang 10.0.1 ] on darwin import os; print(os.environ["CONDA_PREFIX"]) /Users/miranda9/.conda/envs/synthesis
The environment variables are not well documented. You can find CONDA_DEFAULT_ENV
mentioned here: https://www.continuum.io/blog/developer/advanced-features-conda-part-1
The only info on CONDA_PREFIX
I could find is this Issue: https://github.com/conda/conda/issues/2764
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