Detailed explanation of Python dictionary DICT type merging

This article mainly introduces Python dictionary DICT type merging in detail, which has certain reference value. Interested friends can refer to it.

This article shares with everyone the Python dictionary DICT type merging method. Method, for your reference, the specific content is as follows

Some of the key values ​​​​of the dictionary I want are field names of the tables in the database, but some are not. I need to integrate them together, so some of them are in this article. (I have to make up 150 words, but I have no choice. Let’s talk about yesterday’s question. The session in python can only play a role in the requests library? You can’t save the value like in asp.net, and then set the expiration time. For verification? I originally wanted to find a library in python that has similar functions to the cache in asp.net. As a result, the python cache seems to be redis, memcached, mongodb, etc. There are one or two, but in the project It cannot be used in web.py. There is also a problem with using webpy's own session. Can't it be called across .py? Let's study it later)

Program example:

key = ['success', 'dangerous']
value = ''

# 返回的list
result_list = []
index = 0
while index < 4:
 # 中间字典，存储数据，以及防止append覆盖
 result_dict = {}
 _key = key[0]
 value = str(index)
 result_dict[_key] = value
 index = index + 1
 result_list.append(result_dict)
index = 0
return_list = []
print result_list
while index < 4:
 # 中间字典，存储数据，以及防止append覆盖
 result_dict = {}
 _key = key[1]
 value = str(index)
 result_dict[_key] = value
 dictMerge = dict(result_list[index].items() + result_dict.items())
 return_list.append(dictMerge)
 index = index + 1
print return_list

Program output:

Of course you can also play like this:

key = ['success', 'dangerous']
value = ''

# 返回的list
result_list = []
index = 0
while index < 4:
 # 中间字典，存储数据，以及防止append覆盖
 result_dict = {}
 _key = key[0]
 value = str(index)
 result_dict[_key] = value
 index = index + 1
 result_list.append(result_dict)
index = 0
return_list = []
print result_list
while index < 4:
 # 中间字典，存储数据，以及防止append覆盖
 result_dict = {}
 _key = key[1]
 value = str(index)
 result_dict[_key] = value
 if int(result_list[index][&#39;success&#39;]) % 2 != 0:
  dictMerge = dict(result_list[index].items() + result_dict.items())
  result_list.remove(result_list[index])
  result_list.append(dictMerge)
 index = index + 1
print result_list

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