py3: handle some unbound methods __func__

[fchapoton]

CC: @tscrim @jdemeyer @jhpalmieri @a-andre @kiwifb

Component: python3

Author: Frédéric Chapoton

Branch/Commit: 9724e81

Reviewer: François Bissey

Issue created by migration from https://trac.sagemath.org/ticket/24200

[fchapoton]

Commit: 9724e81

[fchapoton]

Branch: u/chapoton/24200

[fchapoton]

New commits:

9724e81

py3: handle some unbound methods __func__

[kiwifb]

comment:2

Looks good to me, it allows to progress further in starting sage with python3.6.

[kiwifb]

Reviewer: François Bissey

[fchapoton]

comment:3

merci !

[kiwifb]

comment:4

Do you already have something for the next "stop"

/usr/lib64/python3.6/site-packages/sage/rings/real_mpfr.pyx in init sage.rings.real_mpfr()
   2033 
   2034             sage: [RR(s).hex() for s in ['+inf', '-inf', 'nan']]
   2035             ['inf', '-inf', 'nan']
   2036         """
   2037         cdef char *s
   2038         cdef int r
   2039         sig_on()
   2040         r = mpfr_asprintf(&s, "%Ra", self.value)
   2041         sig_off()
   2042         if r < 0:  # MPFR free()s its buffer itself in this case
   2043             raise RuntimeError("unable to convert an mpfr number to a string")
   2044         t = str(s)
   2045         mpfr_free_str(s)
   2046         return t
   2047 
-> 2048     hex = __hex__
        global hex = undefined
        global __hex__ = undefined
   2049 
   2050     def __copy__(self):
   2051         """
   2052         Return copy of ``self`` - since ``self`` is immutable, we just return
   2053         ``self`` again.
   2054 
   2055         EXAMPLES::
   2056 
   2057             sage: a = 3.5
   2058             sage: copy(a) is  a
   2059             True
   2060         """
   2061         return self    # since object is immutable.
   2062 
   2063     def _integer_(self, Z=None):

NameError: name '__hex__' is not defined

?

[fchapoton]

comment:5

no ticket yet for the hex problem

in the experimental branch (https://github.com/sagemath/sagetrac-mirror/commits/public/python3-experiment-8.1.rc0) that permit to start sage:

sagemath/sagetrac-mirror@2ffe4e2

I just remove the alias. This is probably not a good solution.

[fchapoton]

comment:6

See #24201 for the hex problem (experts help is needed)

[embray]

comment:7

Instead of the try/except and whatnot we could use six.get_unbound_method() for this. The name is a bit long but can be rebound to something shorter in the import statement.

[vbraun]

Changed branch from u/chapoton/24200 to 9724e81