Python dictionary list conversion and for loop methods-Python Tutorial-php.cn

Python dictionary list conversion and for loop methods

高洛峰

Release： 2017-03-10 18:46:55

Original

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# 原有dict
old_dict = {
    "#1":{ &#39;hostname&#39;:c1, &#39;cpu_count&#39;: 2, &#39;mem_capicity&#39;: 80 },
    "#2":{ &#39;hostname&#39;:c1, &#39;cpu_count&#39;: 2, &#39;mem_capicity&#39;: 80 }
    "#3":{ &#39;hostname&#39;:c1, &#39;cpu_count&#39;: 2, &#39;mem_capicity&#39;: 80 }
}
  
# 新的数据
new_dict = {
    "#1":{ &#39;hostname&#39;:c1, &#39;cpu_count&#39;: 2, &#39;mem_capicity&#39;: 800 },
    "#3":{ &#39;hostname&#39;:c1, &#39;cpu_count&#39;: 2, &#39;mem_capicity&#39;: 80 }
    "#4":{ &#39;hostname&#39;:c2, &#39;cpu_count&#39;: 2, &#39;mem_capicity&#39;: 80 }
}
  
需要删除：？
需要新建：？
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Code:

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

old_dict = {
    "#1":{ &#39;hostname&#39;:&#39;c1&#39;, &#39;cpu_count&#39;: 2, &#39;mem_capicity&#39;: 80 },
    "#2":{ &#39;hostname&#39;:&#39;c1&#39;, &#39;cpu_count&#39;: 2, &#39;mem_capicity&#39;: 80 },
    "#3":{ &#39;hostname&#39;:&#39;c1&#39;, &#39;cpu_count&#39;: 2, &#39;mem_capicity&#39;: 80 }
}
 
# 新的数据
new_dict = {
    "#1":{ &#39;hostname&#39;:&#39;c1&#39;, &#39;cpu_count&#39;: 2, &#39;mem_capicity&#39;: 800 },
    "#3":{ &#39;hostname&#39;:&#39;c1&#39;, &#39;cpu_count&#39;: 2, &#39;mem_capicity&#39;: 80 },
    "#4":{ &#39;hostname&#39;:&#39;c2&#39;, &#39;cpu_count&#39;: 2, &#39;mem_capicity&#39;: 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：
[&#39;#3&#39;]
[&#39;#1&#39;, &#39;#4&#39;]
[&#39;#2&#39;, &#39;#1&#39;]
 
 
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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