dictionary

Asp.net Core导出Excel

由 倾然丶 夕夏残阳落幕 提交于 2020-12-11 13:39:46
本篇文章是在MVC设计模式下，基于windows系统的Excel导出 1.前台的实现不用我多说了吧，加一个a标签链接地址跳到它所调用的方法里面，可以根据当前页面的查询条件去传值，从而查询出你想要的数据然后导出 下面我们就直接来看控制器里的方法和对数据的处理 /// <summary> /// 导出数据 /// </summary> /// <returns></returns> public void ExportData(int pageIndex, int limit, string name, string startVisitTime, string endVisitTime, string addUser) { int count = 0; string fileExt = ".xls"; try { if (pageIndex != 0) { pageIndex = 0; } List<VisitsRecordDto> visitRecord = visitRecordReportInterface.GetVisitRecordList(pageIndex, limit, name, startVisitTime, endVisitTime, addUser, out count); Dictionary<string, string> columnNames =

Top-k on a list of dict in python

由 南笙酒味 提交于 2020-12-11 04:42:27
问题 Is there an easy way to perform the max k number of key:values pair in this example s1 = {'val' : 0} s2 = {'val': 10} s3 = {'val': 5} s4 = {'val' : 4} s5 = {'val' : 6} s6 = {'val' : 7} s7 = {'val' : 3} shapelets = [s1,s2,s3,s4,s5,s6,s7] I want to get the max 5 numbers in the shapelets list, knowing that it contains a key of name "val" and to which a value is assigned. The solution here resides in parsing through the list of dict elements and get the max n numbers of it ( in this case the max

Top-k on a list of dict in python

由 早过忘川 提交于 2020-12-11 04:40:11
问题 Is there an easy way to perform the max k number of key:values pair in this example s1 = {'val' : 0} s2 = {'val': 10} s3 = {'val': 5} s4 = {'val' : 4} s5 = {'val' : 6} s6 = {'val' : 7} s7 = {'val' : 3} shapelets = [s1,s2,s3,s4,s5,s6,s7] I want to get the max 5 numbers in the shapelets list, knowing that it contains a key of name "val" and to which a value is assigned. The solution here resides in parsing through the list of dict elements and get the max n numbers of it ( in this case the max

Top-k on a list of dict in python

由 不羁岁月 提交于 2020-12-11 04:37:33
问题 Is there an easy way to perform the max k number of key:values pair in this example s1 = {'val' : 0} s2 = {'val': 10} s3 = {'val': 5} s4 = {'val' : 4} s5 = {'val' : 6} s6 = {'val' : 7} s7 = {'val' : 3} shapelets = [s1,s2,s3,s4,s5,s6,s7] I want to get the max 5 numbers in the shapelets list, knowing that it contains a key of name "val" and to which a value is assigned. The solution here resides in parsing through the list of dict elements and get the max n numbers of it ( in this case the max

Use Python to count instances of all words in a text file [duplicate]

由 怎甘沉沦 提交于 2020-12-10 13:28:27
问题 This question already has answers here : List of dictionaries - tracking words frequency per file (4 answers) Closed 2 years ago . How would one create a dictionary from a text file? the test file consists of: Von Neumann architecture describes a general framework, or structure, that a computer's hardware, programming, and data should follow. Although other structures for computing have been devised and implemented, the vast majority of computers in use today operate according to the von

Use Python to count instances of all words in a text file [duplicate]

由 陌路散爱 提交于 2020-12-10 13:28:08
问题 This question already has answers here : List of dictionaries - tracking words frequency per file (4 answers) Closed 2 years ago . How would one create a dictionary from a text file? the test file consists of: Von Neumann architecture describes a general framework, or structure, that a computer's hardware, programming, and data should follow. Although other structures for computing have been devised and implemented, the vast majority of computers in use today operate according to the von

Use Python to count instances of all words in a text file [duplicate]

由 浪子不回头ぞ 提交于 2020-12-10 13:24:41
问题 This question already has answers here : List of dictionaries - tracking words frequency per file (4 answers) Closed 2 years ago . How would one create a dictionary from a text file? the test file consists of: Von Neumann architecture describes a general framework, or structure, that a computer's hardware, programming, and data should follow. Although other structures for computing have been devised and implemented, the vast majority of computers in use today operate according to the von

Java容器（List、Set、Map）知识点快速复习手册（中）

由 余生长醉 提交于 2020-12-09 10:35:04
前言 本文快速回顾了Java中容器的知识点，用作面试复习，事半功倍。 上篇：主要为容器概览，容器中用到的设计模式，List源码 中篇：Map源码 下篇：Set源码，容器总结 其它知识点复习手册 Java基础知识点面试手册（上） Java基础知识点面试手册（下） Java容器（List、Set、Map）知识点快速复习手册（上） HashMap http://wiki.jikexueyuan.com/project/java-collection/hashmap.html 源码分析： https://segmentfault.com/a/1190000014293372 关键词 初始容量16 扩容是2倍，加载因子0.75 头插法 0桶存放null 从 JDK 1.8 开始，一个桶存储的链表长度大于 8 时会将链表转换为红黑树（前提：键值对要超过64个） 自动地将传入的容量转换为2的幂次方 保证运算速度：确保用位运算代替模运算来计算桶下标。hash& (length-1)运算等价于对 length 取模。 hash均匀分布：数据在数组上分布就比较均匀，并且能够利用全部二进制位，也就是说碰撞的几率小， table数组+Entry []链表（散列表），红黑树 扩容操作需要把键值对重新插入新的 table 中，重新计算所有key有特殊机制（JDK1.8后） 存储结构

Average value in multiple dictionaries based on key in Python?

由 无人久伴 提交于 2020-12-08 08:03:31
问题 I have three dictionaries (or more): A = {'a':1,'b':2,'c':3,'d':4,'e':5} B = {'b':1,'c':2,'d':3,'e':4,'f':5} C = {'c':1,'d':2,'e':3,'f':4,'g':5} How can I get a dictionary of the average values of every key in the three dictionaries? For example, given the above dictionaries, the output would be: {'a':1/1, 'b':(2+1)/2, 'c':(3+2+1)/3, 'd':(4+3+2)/3, 'e':(5+4+3)/3, 'f':(5+4)/2, 'g':5/1} 回答1: You can use Pandas, like this: import pandas as pd df = pd.DataFrame([A,B,C]) answer = dict(df.mean())

理解 redis 中的 哈希对象类型

由 微笑、不失礼 提交于 2020-12-08 06:26:48
redis中的hash也是我们使用中的高频数据结构，它的构造基本上和编程语言中的HashTable，Dictionary大同小异，如果大家往后有什么逻辑需要用Dictionary存放的话，可以根据场景优先考虑下redis哦，起码可以装装嘛，现在我默认你已经有装的冲动了，打开redis手册，看看有哪些我们用得到的装方法。 一：常用方法 只要是一个数据结构，最基础的永远是CURD，redis中的insert和update，永远只需要set来替代，比如下面的Hset，如下图： 前面几篇文章我都没有挑选一个方法仔细讲解，其实也没什么好讲解的，就好似C#中的一个类的一个方法而已，知道传递一些啥参数就OK了，就比如要说的HSet，它的格式如下： 接下来我在CentOS里面操作一下， [administrator@localhost redis-3.0.5]$ src/redis-cli 127.0.0.1:6379> clear 127.0.0.1:6379> hset person name jack ( integer ) 1 127.0.0.1:6379> hset person age 20 ( integer ) 1 127.0.0.1:6379> hset person sex famale ( integer ) 1 127.0.0.1:6379> hgetall person
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