Passing newline within string into a python script from the command line

From https://stackoverflow.com/a/4918413/478656 in Bash, you can use:

script.py --string $'thing1\nthing2'

e.g.

$ python test.py $'1\n2'
1
2

But that's Bash-specific syntax.

This is really a shell question since the shell does all the command parsing. Python doesn't care what's happening with that and only gets what comes through in the exec system call. If you're using bash, it doesn't do certain kinds of escaping between double quotes. If you want things like \n, \t, or \xnn to be escaped, the following syntax is a bash extension:

python test.py $'thing1\nthing2'

Note that the above example uses single quotes and not double quotes. That's important. Using double quotes causes different rules to apply. You can also do:

python test.py "thing1
thing2"

Here's some more info on bash quoting if you're interested. Even if you're not using bash, it's still good reading:

http://mywiki.wooledge.org/Quotes