python中依据字典的键对字典进行排序

>>> dict1 = {"c":30, "a":40, "b":80, "d":20, "e":60}
>>> dict1
{'c': 30, 'a': 40, 'b': 80, 'd': 20, 'e': 60}
>>> for i in sorted(dict1):          ## 正向排序
...     print(i, dict1[i])
...
a 40
b 80
c 30
d 20
e 60

>>> dict1 = {"c":30, "a":40, "b":80, "d":20, "e":60}      ## 测试字典
>>> dict1
{'c': 30, 'a': 40, 'b': 80, 'd': 20, 'e': 60}
>>> for i in sorted(dict1, reverse = True):        ## 逆向排序
...     print(i, dict1[i])
...
e 60
d 20
c 30
b 80
a 40