code: def available_solvers():
      """Returns a list of all available solvers.
  
      These can be used in :func:`optunity.make_solver`.
      """
      return solver_registry.solver_names()
  
imports: import timeit
  import sys
  import operator
  from .None import functions
  from .None import solvers
  from .None import search_spaces
  from .solvers import solver_registry
  from .util import DocumentedNamedTuple
  from .constraints import wrap_constraints
label_desc: Use image node_id 2 for calling a global function with example usage: available_solvers() and returns: solver_registry