I would like to add a bash magic cell with both a environment variable and a python variable, like this:
!echo "{1+1}" "$HOME"
Expecting it to print:
2 /home/ec2-user
However, this does not evaluate the python expression, output is:
{1+1} /home/ec2-user
Removing the environment variable makes the python expression work:
!echo "{1+1}" "HOME"
2 HOME
What would be the correct syntax for printing both variables?
https://ipython.readthedocs.io/en/stable/interactive/reference.html#system-shell-access
The docs has an example with $$HOME.
In [27]: !echo $HOME
/home/paul
In [28]: !echo $$HOME
/home/paul
In [29]: !echo {i+3} $$HOME
5 /home/paul
Looks like $var can be parsed as either a substitution from a local variable, or pass it on the shell for its evaluation. $$HOME seems to force the shell use. But it's not obvious from the documentation how it handles those details.