code: def is_string_dtype(arr_or_dtype):
      
  
      # TODO: gh-15585: consider making the checks stricter.
      def condition(dtype):
          return dtype.kind in ('O', 'S', 'U') and not is_period_dtype(dtype)
      return _is_dtype(arr_or_dtype, condition)
docs: Check whether the provided array or dtype is of the string dtype.
  
      Parameters
      ----------
      arr_or_dtype : array-like
          The array or dtype to check.
  
      Returns
      -------
      boolean
          Whether or not the array or dtype is of the string dtype.
  
      Examples
      --------
      >>> is_string_dtype(str)
      True
      >>> is_string_dtype(object)
      True
      >>> is_string_dtype(int)
      False
      >>>
      >>> is_string_dtype(np.array(['a', 'b']))
      True
      >>> is_string_dtype(pd.Series([1, 2]))
      False