code: def finite_diff_kauers(sum):
      """
      Takes as input a Sum instance and returns the difference between the sum
      with the upper index incremented by 1 and the original sum. For example,
      if S(n) is a sum, then finite_diff_kauers will return S(n + 1) - S(n).
  
      Examples
      ========
  
      >>> from sympy.series.kauers import finite_diff_kauers
      >>> from sympy import Sum
      >>> from sympy.abc import x, y, m, n, k
      >>> finite_diff_kauers(Sum(k, (k, 1, n)))
      n + 1
      >>> finite_diff_kauers(Sum(1/k, (k, 1, n)))
      1/(n + 1)
      >>> finite_diff_kauers(Sum((x*y**2), (x, 1, n), (y, 1, m)))
      (m + 1)**2*(n + 1)
      >>> finite_diff_kauers(Sum((x*y), (x, 1, m), (y, 1, n)))
      (m + 1)*(n + 1)
      """
      function = sum.function
      for l in sum.limits:
          function = function.subs(l[0], l[-1] + 1)
      return function
  
label_desc: Use image node_id 2 for calling a global function with example usage: finite_diff_kauers(sum) and returns: function