Python 3 preparation: Handle removed execfile() function

[wluebbe]

In Py2 there is the execfile() function, while in Py3 there is none.

The tool 2to3 changes the calls to execfile() to wrapped calls of the builtin open(), compile and exec() functions.
An example of a change lib2to3/fixes/fix_execfile.py is

-        execfile(fpath, globals)
+        exec(compile(open(fpath).read(), fpath, 'exec'), globals)

There are 2 occurences of execfile() in sage/misc/preparser.py.

The code has to depend on the Python version!

This ticket is tracked as a dependency of meta-ticket ticket:16052.

Component: distribution

Author: André Apitzsch

Branch/Commit: 4d24882

Reviewer: Frédéric Chapoton

Issue created by migration from https://trac.sagemath.org/ticket/16066

[a-andre]

Commit: 4d24882

[a-andre]

Branch: u/aapitzsch/ticket/16066

[a-andre]

New commits:

4d24882

replace execfile by python3 compatible functions

[a-andre]

Author: André Apitzsch

[fchapoton]

Reviewer: Frédéric Chapoton

[fchapoton]

comment:4

ok, looks good to me.

[vbraun]

Changed branch from u/aapitzsch/ticket/16066 to 4d24882