code: def _altzeta_generic(ctx, s):
      if s == 1:
          return ctx.ln2 + 0 * s
      return -ctx.powm1(2, 1 - s) * ctx.zeta(s)
  
imports: from __future__ import print_function
  from ..libmp.backend import xrange
  from .functions import defun, defun_wrapped, defun_static
label_desc: Use image node_id 22 for calling a global function with example usage: _altzeta_generic(ctx, s) and returns: unknown, unknown