Conda offers you the flexibility of being able to build things
that are not Python related. The first 2 sample recipes,
libtiff, are examples of non-Python libraries, meaning
they do not require Python to run or build.
boost is an example of a popular programming library and illustrates the use of selectors in a recipe.
libtiff is another example of a compiled library, which shows how conda can apply patches to source directories before building the package.
gensim works on Python 2, and all of the others work on both Python 2 and Python 3.