python实现将列表中各个值快速赋值给多个变量
作者：liu2242947853
这篇文章主要介绍了python实现将列表中各个值快速赋值给多个变量，具有很好的参考价值，希望对大家有所帮助。一起跟随小编过来看看吧
我就废话不多说啦，还是直接看代码吧！
list1 = [1,2,3,4]
a,b,c,d = list1
则
a = 1
b =2
等
这种方式只有当左边的操作数个数和list1长度相同时,才可以这么做,不然报错.
我们假设我们有一个list对象List,它的长度足够长,想把它从下标i开始的k个元素赋给k个元素,可以这么做:
v1, v2, v3, …, vk = List[i : i + k] #默认i=0, k=len(List)
补充知识：python 将某个字段存储为列表类型
实现存储数据格式为
{
"_index": "nested-20180815",
"_type": "stb-iptv-montor-m-gather-apk",
"_id": "AWU8sZboGQQbsn0rAW4J",
"_score": 1,
"_source": {
"mdiNested": [
{
"mdiMLR": 0,
"mdiType": "0"
},
{
"mdiMLR": 0,
"mdiType": "1"
},
{
"mdiMLR": 0,
"mdiType": "2"
},
{
"mdiMLR": 0,
"mdiType": "3"
},
{
"mdiMLR": 0,
"mdiType": "4"
},
{
"mdiMLR": 0,
"mdiType": "5"
}
]
}
}
代码：
from elasticsearch import Elasticsearch
from elasticsearch import helpers
import json
es_20 = Elasticsearch(hosts="1.0.0.0", port=9200, timeout=15000)
time_ = "20180815"
index_20 = "nested-{0}".format(time_)
type_20 = "stb-iptv-montor-m-gather-apk"
def set_mapping():
my_mappping = {
type_20: {
"properties": {
"mdiNested": {
"properties": {
"mdiMLR": {
"type": "short"
},
"mdiType": {
"type": "keyword"
}
}
}
}
}
}
create_index = es_20.indices.create(index=index_20, body=None)
create_mapping = es_20.indices.put_mapping(index=index_20, body=my_mappping, doc_type=type_20)
mdiMLR = [0,1,2,3,4]
mdiType = ["0","1","2","3","4","5"]
actions = []
dict_ ={}
for mdiMLR_ in mdiMLR:
dict_list = []
for type in mdiType:
t1 ={'mdiMLR': mdiMLR_, 'mdiType': type}
dict_list.append(t1)
action = {
"_index": index_20,
"_type": type_20,
"_source": {
"mdiNested": dict_list
}
}
actions.append(action)
helpers.bulk(es_20, actions)
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