Q:

How to set env variable in Jupyter notebook

I've a problem that Jupyter can't see env variable in bashrc file, is there a way to load these variables in jupyter or add custome variable to it?

A:

To set an env variable in a jupyter notebook, just use a % magic commands, either %env or %set_env, e.g., %env MY_VAR=MY_VALUE or %env MY_VAR MY_VALUE.  (Use %env by itself to print out current environmental variables.)
See: http://ipython.readthedocs.io/en/stable/interactive/magics.html

A:

You can also set the variables in your kernel.json file:
My solution is useful if you need the same environment variables every time you start a jupyter kernel, especially if you have multiple sets of environment variables for different tasks.
To create a new ipython kernel with your environment variables, do the following:

Read the documentation at https://jupyter-client.readthedocs.io/en/stable/kernels.html#kernel-specs
Run jupyter kernelspec list to see a list with installed kernels and where the files are stored.
Copy the directory that contains the kernel.json (e.g. named python2) to a new directory (e.g. python2_myENV).
Change the display_name in the new kernel.json file.
Add a env dictionary defining the environment variables.

Your kernel json could look like this (I did not modify anything from the installed kernel.json except display_name and env):
{
 "display_name": "Python 2 with environment",
 "language": "python",
 "argv": [
  "/usr/bin/python2",
  "-m",
  "ipykernel_launcher",
  "-f",
  "{connection_file}"
 ],
 "env": {"LD_LIBRARY_PATH":""}
}

Use cases and advantages of this approach

In my use-case, I wanted to set the variable LD_LIBRARY_PATH which effects how compiled modules (e.g. written in C) are loaded. Setting this variable using %set_env did not work.
I can have multiple python kernels with different environments.
To change the environment, I only have to switch/ restart the kernel, but I do not have to restart the jupyter instance (useful, if I do not want to loose the variables in another notebook). See -however - https://github.com/jupyter/notebook/issues/2647

A:

You can setup environment variables in your code as follows:
import sys,os,os.path
sys.path.append(os.path.expanduser('~/code/eol_hsrl_python'))
os.environ['HSRL_INSTRUMENT']='gvhsrl'
os.environ['HSRL_CONFIG']=os.path.expanduser('~/hsrl_config')

This if of course a temporary fix, to get a permanent one, you probably need to export the variables into your ~.profile, more information can be found here

