Python中字典排序

如字典dic={'a':1,'f':2,'c':3,'h':0};要对其进行排序:

函数原型:sorted(dic,value,reverse); 

1. dic为比较函数;
2. value为比较对象(键或值);
3. reverse：注明升序还是降序,True--降序,False--升序（默认）;

   import operator;    
   # 字典中排序
   def sortDict():
       dic={'a':1,'f':2,'c':3,'h':0};
       # 函数原型：sorted(dic,value,reverse)
       # 按字典中的键进行升序排序
       print("按键进行升序排序结果为:",
             sorted(dic.items(),key=operator.itemgetter(0),reverse=False));
       # 按字典中的键进行降序排序
       print("按键进行降序排序结果为:",
             sorted(dic.items(),key=operator.itemgetter(0),reverse=True));
       # 按字典中的值进行升序排序
       print("按值进行升序排序结果为:",
             sorted(dic.items(),key=operator.itemgetter(1),reverse=False));
       # 按字典中的值进行降序排序
       print("按值进行降序排序结果为:",
             sorted(dic.items(),key=operator.itemgetter(1),reverse=True));

   运行结果为:

   >>> import randMatrix;
   >>> sortDict()
   按键进行升序排序结果为: [('a', 1), ('c', 3), ('f', 2), ('h', 0)]
   按键进行降序排序结果为: [('h', 0), ('f', 2), ('c', 3), ('a', 1)]
   按值进行升序排序结果为: [('h', 0), ('a', 1), ('f', 2), ('c', 3)]
   按值进行降序排序结果为: [('c', 3), ('f', 2), ('a', 1), ('h', 0)]

    iteritems()函数:

•  iteritems()以迭代器对象返回字典键值对;

• 和item相比:items以列表形式返回字典键值对

  >>> dic={'a':1,'f':2,'c':3,'h':0};
  >>> dic.items()
  dict_items([('f', 2), ('h', 0), ('c', 3), ('a', 1)])
  >>> dic.iteritems()
  Traceback (most recent call last):
    File "<pyshell#34>", line 1, in <module>
      dic.iteritems()
  AttributeError: 'dict' object has no attribute 'iteritems'
  >>> print(dic.iteritems())
  Traceback (most recent call last):
    File "<pyshell#35>", line 1, in <module>
      print(dic.iteritems())
  AttributeError: 'dict' object has no attribute 'iteritems'

  在Python3.4.2中没有iteritems()函数,所以报错;