In requests for help for cythonized built-in methods, the signature of the method is not shown, unlike normal python methods. For an example,

sage: a=17 
sage: a.quo_rem?

Docstring:     
   Returns the quotient and the remainder of self divided by other.
   Note that the remainder returned is always either zero or of the
   same sign as other.

   INPUT:

   * "other" - the divisor

   OUTPUT:

   * "q" - the quotient of self/other

   * "r" - the remainder of self/other

   EXAMPLES:

      sage: z = Integer(231)
      sage: z.quo_rem(2)
      (115, 1)
...

To fix this, we set Cython directive binding=True. Thus we buy

• better support of introspection into cython methods,
• consistent help messages for cython methods like python methods,
• better tracebacks on exceptions,
• better behaving for documentation

for slight performance degradation due to increased overhead cost of calling cython methods.

Related tickets: #19100, #20860, #18192

Depends on #32509
Depends on #33864

CC: @jdemeyer @tscrim @mkoeppe

Component: user interface

Author: Kwankyu Lee, Tobias Diez

Branch/Commit: public/26254 @ 326f19c

Reviewer: Tobias Diez, ...

Issue created by migration from https://trac.sagemath.org/ticket/26254