code: def validate_markevery(s):
      """
      Validate the markevery property of a Line2D object.
  
      Parameters
      ----------
      s : None, int, (int, int), slice, float, (float, float), or list[int]
  
      Returns
      -------
      None, int, (int, int), slice, float, (float, float), or list[int]
      """
      # Validate s against type slice float int and None
      if isinstance(s, (slice, float, int, type(None))):
          return s
      # Validate s against type tuple
      if isinstance(s, tuple):
          if len(s) == 2 and (
              all(isinstance(e, int) for e in s)
              or all(isinstance(e, float) for e in s)
          ):
              return s
          else:
              raise TypeError(
                  "'markevery' tuple must be pair of ints or of floats"
              )
      # Validate s against type list
      if isinstance(s, list):
          if all(isinstance(e, int) for e in s):
              return s
          else:
              raise TypeError(
                  "'markevery' list must have all elements of type int"
              )
      raise TypeError("'markevery' is of an invalid type")
  
imports: import ast
  from functools import lru_cache, reduce
  from numbers import Real
  import operator
  import os
  import re
  import numpy
  from matplotlib import _api, cbook
  from matplotlib.cbook import ls_mapper
  from matplotlib.colors import Colormap, is_color_like
  from matplotlib._fontconfig_pattern import parse_fontconfig_pattern
  from matplotlib._enums import JoinStyle, CapStyle
  from cycler import Cycler, cycler
label_desc: Use image node_id 29 for calling a global function with example usage: validate_markevery(s) and returns: s, s, s