code: def separate_my_zero(
      ctx, my_zero_number, zero_number_block, T, V, prec
  ):
      """If we know which zero of this block is mine,
      the function separates the zero"""
      variations = 0
      v0 = V[0]
      for k in range(1, len(V)):
          v1 = V[k]
          if v0 * v1 < 0:
              variations += 1
              if variations == my_zero_number:
                  k0 = k
                  leftv = v0
                  rightv = v1
          v0 = v1
      t1 = T[k0]
      t0 = T[k0 - 1]
      ctx.prec = prec
      wpz = wpzeros(my_zero_number * ctx.log(my_zero_number))
  
      guard = 4 * ctx.mag(my_zero_number)
      precs = [ctx.prec + 4]
      index = 0
      while precs[0] > 2 * wpz:
          index += 1
          precs = [precs[0] // 2 + 3 + 2 * index] + precs
      ctx.prec = precs[0] + guard
      r = ctx.findroot(
          lambda x: ctx.siegelz(x),
          (t0, t1),
          solver="illinois",
          verbose=False,
      )
      # print "first step at", ctx.dps, "digits"
      z = ctx.mpc(0.5, r)
      for prec in precs[1:]:
          ctx.prec = prec + guard
          # print "refining to", ctx.dps, "digits"
          znew = z - ctx.zeta(z) / ctx.zeta(z, derivative=1)
          # print "difference", ctx.nstr(abs(z-znew))
          z = ctx.mpc(0.5, ctx.im(znew))
      return ctx.im(z)
  
file_path: catboost/contrib/python/mpmath/py3/mpmath/functions/zetazeros.py
imports: from .functions import defun, defun_wrapped
label_desc: Use image node_id 4 for calling a global function with example usage: separate_my_zero(ctx, my_zero_number, zero_number_block, T, V, prec) and returns: ctx