比较python中两个字典的最有效方法

Question

dic1 = {'memory':'4','cpu':'2','disk':{'total':'160','swap':'4','/':'26','/var':'7','/tmp':'2'}}

dic2 = {'memory':8','cpu':'2','disk':{'total':'120,'swap':'4','/':'26','/var':'7','/tmp':'2'}}

Please note that both dictionaries itself contains another dictionary. What is the most efficient way to compare each items without doing dict1==dict2 ?

Since i have to see some % change in values. So the only option left is iterating thru each dictionary items. something like:

for key1 in dic1:
   for key2 in dic2:
      if not isinstance(dic1[key1],dict):
         #compare cpu & memory here
         if int(dic1[key1]) > int(dict2[key2])
      else:
          #compare disk(internal dictionary here)

Answer 1

You can use itertools.zip_longest to zip the values and compare them in a list comprehension :

>>> from itertools import chain,zip_longest

["do something" if isinstance(i,dict) and all(k<v for k,v in zip_longest(i.values(),j.values())) else "do something" for i,j in zip_longest(dic1.values(),dic2.values())]

Note that here based on your need you can use another function instead of all you may be interest to use any or maybe you want to to some arithmetic operation on the values.