Python dictionary list conversion and for loop methods

Find the difference

# 原有dict
old_dict = {
    "#1":{ 'hostname':c1, 'cpu_count': 2, 'mem_capicity': 80 },
    "#2":{ 'hostname':c1, 'cpu_count': 2, 'mem_capicity': 80 }
    "#3":{ 'hostname':c1, 'cpu_count': 2, 'mem_capicity': 80 }
}
  
# 新的数据
new_dict = {
    "#1":{ 'hostname':c1, 'cpu_count': 2, 'mem_capicity': 800 },
    "#3":{ 'hostname':c1, 'cpu_count': 2, 'mem_capicity': 80 }
    "#4":{ 'hostname':c2, 'cpu_count': 2, 'mem_capicity': 80 }
}
  
需要删除：？
需要新建：？
需要更新：？

Code:

#-*-coding:utf-8-*-
# Original data

old_dict = {
    "#1":{ 'hostname':'c1', 'cpu_count': 2, 'mem_capicity': 80 },
    "#2":{ 'hostname':'c1', 'cpu_count': 2, 'mem_capicity': 80 },
    "#3":{ 'hostname':'c1', 'cpu_count': 2, 'mem_capicity': 80 }
}
 
# 新的数据
new_dict = {
    "#1":{ 'hostname':'c1', 'cpu_count': 2, 'mem_capicity': 800 },
    "#3":{ 'hostname':'c1', 'cpu_count': 2, 'mem_capicity': 80 },
    "#4":{ 'hostname':'c2', 'cpu_count': 2, 'mem_capicity': 80 }
}
  
old_set = set(old_dict.keys())
update_list = list(old_set.intersection(new_dict.keys()))
for i in update_list:
     if cmp(old_dict[i],new_dict[i]) != 0:
         update_list.remove(i)
       
#print update_list
 
 
new_list = []
del_list = []
 
for i in new_dict.keys():
    if i not in update_list:
        new_list.append(i)
for i in old_dict.keys():
    if i not in update_list:
        del_list.append(i)
 
print update_list
print new_list
print del_list
运行结果：
['#3']
['#1', '#4']
['#2', '#1']
 
 
本节使用了字典与列表的转换，列表移除某个值，for循环，cmp内置函数，if判断

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