RealSet: Use self.__class__.__base__ in methods when constructing a new RealSet

[mkoeppe]

... instead of hardcoding RealSet. This is preparation for #34278.

(split out from #32170 - sagemath/sagetrac-mirror@develop...public/32170)

Depends on #32181

CC: @yuan-zhou @tscrim

Component: basic arithmetic

Author: Binshuai Wang, Matthias Koeppe, Yuan Zhou

Branch/Commit: u/yzh/realset__use_self___class___in_methods_when_constructing_a_new_realset @ eef3886

Issue created by migration from https://trac.sagemath.org/ticket/34277

[mkoeppe]

Branch: u/mkoeppe/realset__use_self___class___in_methods_when_constructing_a_new_realset

[mkoeppe]

Author: Binshuai Wang, ...

[mkoeppe]

comment:2

Cherry-picked from #32170

---

New commits:

5f60c49

make a whole change for RealSet class with using 'self.__class__' and '@classmethod'

[mkoeppe]

Commit: 5f60c49

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. Last 10 new commits:

44926c8	better pyflakes, better handle of RealSet(x != oo)
c9d4746	update RealSet.union and RealSet.intersection to handle several real sets
ebd3b77	Better pygments style
73e5aa3	Make white logo transparent to match with furo
523b49a	Merge branch 'u/klee/34252' of git://trac.sagemath.org/sage into t/32181/realset__faster_operations_by_scan_line__merging__techniques
a864fdc	fix typo
3f6a0ac	revive RealSet.normalize
79f2014	revise the docstring of RealSet.is_connected
1ef7dd1	remove unnecessary bool()
a856e5d	Merge #32181

[sagetrac-git]

Changed commit from 5f60c49 to a856e5d

[mkoeppe]

Dependencies: #32181

[mkoeppe]

Changed author from Binshuai Wang, ... to Binshuai Wang, Matthias Koeppe, ...

[mkoeppe]

comment:4

Merged #32181 and resolved merge conflicts.

Haven't checked whether everything that needs to be changed to __class__ has been changed.

[mkoeppe]

Description changed:

--- 
+++ 
@@ -1,4 +1,4 @@
-... instead of hardcoding `RealSet`.
+... instead of hardcoding `RealSet`. This is preparation for #34278.
 
 (split out from #32170 - https://github.com/sagemath/sagetrac-mirror/compare/develop...public/32170)
 

[yuan-zhou]

comment:6

Bug example:

sage: r = RealSet(2,10)
sage: RealSet(x > 2).intersection(RealSet(x < 10)) is RealSet(r[0], normalized=True)

Expect True. Got False.