code: def round_down(x, decimal_places):
      
      from math import floor
      d = int('1' + ('0' * decimal_places))
      return floor(x * d) / d
docs: Round a float down to decimal_places.
  
      Parameters
      ----------
      x : float
      decimal_places : int
  
      Returns
      -------
      rounded_float : float
  
      Examples
      --------
      >>> round_down(1.23456, 3)
      1.234
      >>> round_down(1.23456, 2)
      1.23