大约有 1,500 项符合查询结果（耗时：0.0210秒） [XML]
Good reasons NOT to use a relational database?
..., but with a bit more ability to validate the structure.
Spreadsheet / CSV file
Very easy model for business users to understand
Subversion (or similar disk based version control system)
Very good support for versioning of data
Berkeley DB (Basically, a disk based hashtable)
Very s...
python pandas remove duplicate columns
...probably with the duplicate column titles.
For a sample table file 'dummy.csv' I made up:
Time H1 N2 Time N2 Time Relative
3 13 13 3 13 0
1 15 15 1 15 14
14 19 19 14 19 14
19 5 5 19 5 1
using read_table gives unique columns and works properly:
In [151]: df2 =...
Alternative to google finance api [closed]
...hoo Finance API posted on
Google Code.
For beginners, you can generate a CSV with a simple API call:
http://finance.yahoo.com/d/quotes.csv?s=AAPL+GOOG+MSFT&f=sb2b3jk
(This will generate and save a CSV for AAPL, GOOG, and MSFT)
Note that you must append the format to the query string (f=..)...
UnicodeDecodeError: 'utf8' codec can't decode byte 0x9c
...g the engine from C to Python did the trick for me.
Engine is C:
pd.read_csv(gdp_path, sep='\t', engine='c')
'utf-8' codec can't decode byte 0x92 in position 18: invalid start byte
Engine is Python:
pd.read_csv(gdp_path, sep='\t', engine='python')
No errors for me.
...
Generating an Excel file in ASP.NET [closed]
...
CSV
Pros:
Simple
Cons:
It may not work in other locales or in different Excel configurations (i.e. List separator)
Can't apply formatting, formulas, etc
HTML
Pros:
Still pretty Simple
Supports simple format...
In C#, how can I create a TextReader object from a string (without writing to disk)
I'm using A Fast CSV Reader to parse some pasted text into a webpage. The Fast CSV reader requires a TextReader object, and all I have is a string. What's the best way to convert a string into a TextReader object on the fly?
...
Recursively look for files with a specific extension
...
find {directory} -type f -name '*.extension'
Example: To find all csv files in the current directory and its sub-directories, use:
find . -type f -name '*.csv'
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C#中数组、ArrayList和List三者的区别 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...List< T> 始终只具有一个维度。但是，您可以轻松创建数组列表或列表的列表。特定类型（Object 除外）的数组 的性能优于 ArrayList的性能。 这是因为 ArrayList的元素属于 Object 类型；所以在存储或检索值类型时通常发生装箱和取消...
app inventor什么时候需要用到字典块？ - App Inventor 2 中文网 - 清泛网 ...
app inventor什么时候需要用到字典块？列表能完成字典的绝大部分功能，不过字典具有比列表更好的查找性能，因此如果要对数据结构执行大量的操作，建议优先使用字典。更多用法请查看文档：https: www fun123 cn referen 列表能完...
蓝牙客户端组件（SPP经典蓝牙）vs BluetoothLE拓展（低功耗蓝牙）基础代码...
...经典蓝牙），特点是必须实现配对成功，才能显示在设备列表中。https://www.fun123.cn/reference/ ... tml#BluetoothClient
显示列表：
选设备：
断开当前连接的设备：
错误处理：
---------------------
BluetoothLE拓展（低功耗蓝...