Javascript issue inside of a Python Module

I'm trying to have Python run some Javascript, and I am running into a few issues. Namely that when I am trying to inject some text into a textarea of a page, it doesn't seem to work if and only if there is a newline (\n) as part of the variable inserted for the Javascript.

Here's my line:

br.runjs("document.getElementById('edit-body').value = 开发者_如何学编程'%s'" % (brag))

if the variable "brag" has any sort of newline in it at all, the insertion does not work. Any idea how to go around this?

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Encode brag as JSON and then use that.