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【未发布】【第七课】问答类App开发 - App Inventor 2 中文网 - 清泛IT社区...
课程目的：
熟悉csv等文本的处理方式，熟悉网络组件。熟悉json数据格式（互联网通用格式），本地及云数据存储。
难度系数：3星
【基础入门班】【大作业】爱学习App - App Inventor 2 中文网 - 清泛IT社区...
...错误的题目可以专门练习。
分数要存储分析
题目数据csv文件，导入
------------------------------数据结构参考---------------------------
练习模式：
英文，中文
hello,你好
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题目类型，题面，正确答案，干扰答案
选择题，1+1=...
【可动态编辑表格】App Inventor 2 Dynamic Editable HTML Table - App应用...
...lor=rgba(0, 0, 0, 0.54)This example will allow you to:
Display an AI2 (in csv format e.g. header row, then data rows) list in an html table. It will also allow you (with the exception of the header row) to create new rows, edit any row, and delete any row, whilst returning the saved/upda...
Filter rows which contain a certain string
...ics
# http://stat-computing.org/dataexpo/2009/the-data.html
df <- read_csv("Downloads/2008.csv")
print(dim(df))
# [1] 7009728 29
benchmark(
"str_detect" = {df %>% filter(str_detect(Dest, 'MCO|BWI'))},
"grepl" = {df %>% filter(grepl('MCO|BWI', Dest))},
replications = 10,
colum...
What is the best way to tell if a character is a letter or number in Java without using regexes?
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In e.g., German, an ä could be considered to be in the a-z range.
– Robert
Aug 27 '18 at 23:17
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Why do I get a SyntaxError for a Unicode escape in my file path?
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f = open('C:\\Users\\Pooja\\Desktop\\trolldata.csv')
Use '\\' for python program in Python version 3 and above..
Error will be resolved..
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How to disable HTML button using JavaScript?
...#btnPlaceOrder').prop('disabled',false);
– Dominik Späte
Aug 10 '17 at 12:57
add a comment
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How to enter quotes in a Java string?
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This tiny java method will help you produce standard CSV text of a specific column.
public static String getStandardizedCsv(String columnText){
//contains line feed ?
boolean containsLineFeed = false;
if(columnText.contains("\n")){
containsLineFeed = true;...
How can I reorder my divs using only CSS?
Given a template where the HTML cannot be modified because of other requirements, how is it possible to display (rearrange) a div above another div when they are not in that order in the HTML? Both div s contain data that varies in height and width.
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How to kill a process running on particular port in Linux?
...ilegues to get process names via netstat.
– Jonas Schäfer
Jul 20 '12 at 16:46
2
@JonasWielicki y...