code: def dmp_diff(f, m, u, K):
      """
      ``m``-th order derivative in ``x_0`` of a polynomial in ``K[X]``.
  
      Examples
      ========
  
      >>> from sympy.polys import ring, ZZ
      >>> R, x,y = ring("x,y", ZZ)
  
      >>> f = x*y**2 + 2*x*y + 3*x + 2*y**2 + 3*y + 1
  
      >>> R.dmp_diff(f, 1)
      y**2 + 2*y + 3
      >>> R.dmp_diff(f, 2)
      0
  
      """
      if not u:
          return dup_diff(f, m, K)
      if m <= 0:
          return f
  
      n = dmp_degree(f, u)
  
      if n < m:
          return dmp_zero(u)
  
      deriv, v = [], u - 1
  
      if m == 1:
          for coeff in f[:-m]:
              deriv.append(dmp_mul_ground(coeff, K(n), v, K))
              n -= 1
      else:
          for coeff in f[:-m]:
              k = n
  
              for i in range(n - 1, n - m, -1):
                  k *= i
  
              deriv.append(dmp_mul_ground(coeff, K(k), v, K))
              n -= 1
  
      return dmp_strip(deriv, u)
  
imports: from sympy.polys.densearith import dup_add_term, dmp_add_term, dup_lshift, dup_add, dmp_add, dup_sub, dmp_sub, dup_mul, dmp_mul, dup_sqr, dup_div, dup_rem, dmp_rem, dmp_expand, dup_mul_ground, dmp_mul_ground, dup_quo_ground, dmp_quo_ground, dup_exquo_ground, dmp_exquo_ground
  from sympy.polys.densebasic import dup_strip, dmp_strip, dup_convert, dmp_convert, dup_degree, dmp_degree, dmp_to_dict, dmp_from_dict, dup_LC, dmp_LC, dmp_ground_LC, dup_TC, dmp_TC, dmp_zero, dmp_ground, dmp_zero_p, dup_to_raw_dict, dup_from_raw_dict, dmp_zeros
  from sympy.polys.polyerrors import MultivariatePolynomialError, DomainError
  from sympy.utilities import variations
  from math import ceil, log
label_desc: Use image node_id 6 for calling a global function with example usage: dmp_diff(f, m, u, K) and returns: dmp_strip, dup_diff, f, dmp_zero