While thinking about similarity between two time series, one can use DTW to approach the issue. There is a Python package for that mlpy.
It is also said to compare time series via simple euclidean distance.
Is there a Python package to this?
This only makes sense if you look at the time series as vectors with same length. In that case, there is no need for a package. Just use, for example,
numpy.linalg.norm(a-b)
.