Let attrcall objects accept further arguments

[nthiery]

The attached patch allows for the following:

            sage: xseries = attrcall('series', x)
            sage: xseries(sin(x), 4)
            1*x + (-1/6)*x^3 + Order(x^4)

This is used in #7753

CC: @sagetrac-sage-combinat

Component: misc

Keywords: attrcall

Author: Nicolas M. Thiéry

Reviewer: Mike Hansen

Merged: sage-4.3.1.alpha2

Issue created by migration from https://trac.sagemath.org/ticket/7842

[nthiery]

Attachment: trac_7842-attrcall-nt.patch.gz

[mwhansen]

comment:2

Another nice thing to have now that I think about it would be this syntax:

sage: xseries = attrcall.series(x)
sage: xseries(sin(x), 4)
1*x + (-1/6)*x^3 + Order(x^4)

I'll make a new ticket for this so that that it'll backward-compatible with the old version.

[nthiery]

comment:3

Replying to @mwhansen:

Another nice thing to have now that I think about it would be this syntax:

sage: xseries = attrcall.series(x)
sage: xseries(sin(x), 4)
1*x + (-1/6)*x^3 + Order(x^4)

Your point is that this syntax gives a better visual hint about this being about method calls, right? So here, attrcall would be some sort of dummy object placeholder? Why not. Though I am a bit reluctant with having two syntaxes.

I'll make a new ticket for this so that that it'll backward-compatible with the old version.

Do you mind reviewing this first, so that we can get #7753 in?

I'll review your patch in return :-)

[mwhansen]

comment:4

This patch looks good to me.

We should also maybe allow putting keywords in too at the "second stage".

[mwhansen]

Reviewer: Mike Hansen

[rlmill]

Merged: 4.3.1.alpha2

[sagetrac-mvngu]

Changed merged from 4.3.1.alpha2 to sage-4.3.1.alpha2