class_docstr: Generic histogram class for real numbers
  
  Example:
  
      >>> h = Histogram(5)     # Initializing, bin width = 5
      >>> h << [2,3,2,7,8,5,5,0,7,9]     # Adding more items
      >>> print(h)
      N = 10, mean +- sd: 4.8000 +- 2.9740
      [ 0,  5): **** (4)
      [ 5, 10): ****** (6)
docstr: Generator returning the bins of the histogram in increasing order
  
  @return: a tuple with the following elements: left bound, right bound,
    number of elements in the bin
docstr_tok: ["Generator","returning","the","bins","of","the","histogram","in","increasing","order","@","return",":","a","tuple","with","the","following","elements",":","left","bound",",","right","bound",",","number","of","elements","in","the","bin"]
code: def bins(self):
      """Generator returning the bins of the histogram in increasing order
  
      @return: a tuple with the following elements: left bound, right bound,
        number of elements in the bin"""
      x = self._min
      for elem in self._bins:
          yield (x, x + self._bin_width, elem)
          x += self._bin_width
  
imports: import math
label_desc: Use image node_id 10 for calling the Histogram obj's underlying member method code with example usage: obj.bins() without return types