Is it possible to run (may be partially) Sage with Python 3?

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(Edited 2019-05-28 after much progress was made thanks to @FrédéricC and a few other developers).

You can download the source for Sage and compile it for Python 3.

For that, change to the directory containing the sources and run

$ make configure
$ ./configure --with-python=3
$ make

Before the documentation was made to build with Python 3, it was advised to run make build instead of make, but this is now fixed.

Making all tests pass is the object of

• Sage Trac ticket 26212: py3: make all tests pass

Note that CoCalc lets you use "Sage Py3" and "Sage development Py3" in the terminal or in CoCalc's .sagews worksheets or in Jupyter.

There is some old code for wrapping functions in a pickleable jacket: https://trac.sagemath.org/attachment/... and there is code that comes packaged with sage to pickle functions: sage.misc.fpickle (the first one goes through some effort to try and pickle closures correctly as well -- something that lambda functions are likely to be. I'm not sure if the second will handle that). In all cases, beware that while pickle goes through great lengths to be backwards compatible with older versions, this does not at all apply when you pickle code objects.