#15989: Python 3 preparation: Change print statement to print() function
--------------------------------+------------------------
Reporter: wluebbe | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.2
Component: distribution | Resolution:
Keywords: python3 | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
--------------------------------+------------------------
Comment (by wluebbe):
I took the following approach:
1. Run {{{futurize -f print_with_import.py}\}.
This changed about 200 py modules.
1. Run the doctests.
There were failures in about 480 .py/.rst-files. The file with the
failures had almost 40.000 lines.
1. I started (slowly) to fix the doctests by wrapping the print parameters
in parenthesis.
But the I began to doubt whether this is the right thing to do:
* Doctests are not only about //test// but also about //documentation//!
* William Stein made a case (https://groups.google.com/d/msg/sage-
devel/r-85whQZGhY/72FfjeFt6Z4J) for enabling the preparser to change print
statements to print functions as required.
Now I think it would better to
* First enable the preparser to change the print statement syntax into the
function syntax whenever "print" refers to '<built-in function print>'
(which is the case in Py3 but also in Py2 when {{{from __future__ import
print_function}}} is in effect).
* Then add parenthesis to the print statements in the py modules (adding
{{{from __future__ import}}} is optional).
* If required (because of ">>>file" or a trailing comma) use the new
function syntax with {{{from __future__ import print_function}}}.
* Doctest should by changed if and when considered reasonable.
--
Ticket URL: <http://trac.sagemath.org/ticket/15989#comment:6>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac.
For more options, visit https://groups.google.com/d/optout.
