Just to take a look at how much different modules deppend on each other
right now, I did some quick analysis by looking at the import statements of
the .py files in the sage library.
The results of this quick experiment are as follows:
1. there are 9 modules in the base of the dependency graph (that is,
avery other module imports something from them, or from other modules that
imports something on them, or so on). They are schemes, ext, docbuild,
version, env, all_cmdline, all, all_notebook, and notebook
2. over them there is a big set of modules that have circular
dependencies between them. That is, they import something from the previous
set, or from other module in this set. They are probability,
data_structures, misc, combinat, server, quadratic_forms, homology, plot,
functions, stats, matrix, rings, categories, algebras, calculus, arith,
finance, symbolic, interfaces, numerical, modular, repl, groups, databases,
libs, parallel, structure, geometry, modules, typeset, graphs, quivers,
doctest, sets, gsl, monoids.
3. Then there are 16 modules that import something from the previous two
lists, but not from anything on this level. They are: games, tensor,
matroids, knots, interacts, crypto, dev, logic, lfunctions,
dynamics, sat, coding, game_theory, tests, sandpiles, media
4. Finally, there is manifolds, that imports from tensor and from level
(2).
As I said, this is just a quick look (for instance, I didn't consider lazy
imports). But I think it gives an idea of what is already moreless
independent, and what is pretty much entangled with the rest of the
components. One would be tempted to say that (2) consists of the "core" of
the Sage library, whereas (1) are its dependencies and (3) and (4) would be
"extra" modules that deppend on the core library. But again, this is just a
first impression after a quick look.
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