Python is one of the most relevant programming languages in the computing landscape. It has been backed by great companies like Google in such a way that its flagship products are developed first in Python.
Recently, I heard about Twisted Python and it looks pretty similar to Node.js. I read this post and certainly they are similar but the post writer switched from a Twisted to Node because the Twisted's programming model was not easy to follow and this misunderstanding created problems during the development process of their application.
For me, Python keeps doing a great job on different areas and different scenarios from small computing (e.g. Raspberry Pi) to big computing (e.g. Scientific Computing - ScyPy and IPython).
Python is an attractive language because its syntax is pretty simple. Expert people coming from diverse areas of knowledge can easily express their ideas and turning into algorithms with important dividends.