大约有 22,000 项符合查询结果（耗时：0.0257秒） [XML]
Selecting with complex criteria from pandas.DataFrame
... A B C
0 9 40 300
1 9 70 700
2 5 70 900
3 8 80 900
4 7 50 200
5 9 30 900
6 2 80 700
7 2 80 400
8 5 80 300
9 7 70 800
We can apply column operations and get boolean Series objects:
>>> df["B"] > 50
0 False
1 True
2 True
3 True
4 Fal...
二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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对每个块的纠错码
1
1
67 85 70 134 87 38 85 194 119 50 6 18 6 103 38
213 199 11 45 115 247 241 223 229 248 154 117 154 111 86 161 111 39
2
246 246 66 7 118 134 242 7 38 86 22 198 199 146 6
87 204 96 60 202 182 124 157 200 134 27 129 209 17 163 163 120 133
...
Creating a UICollectionView programmatically
...ut sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
return CGSizeMake(50, 50);
}
Output---
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Resizing SVG in html?
...ust XML), and look for something like this at the top:
<svg ... width="50px" height="50px"...
Erase width and height attributes; the defaults are 100%, so it should stretch to whatever the container allows it.
share
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bash HISTSIZE vs. HISTFILESIZE?
...command history), is truncated to contain HISTFILESIZE=10 lines.
You write 50 lines.
At the end of your 50 commands, only commands 41 to 50 are in your history list, whose size is determined by HISTSIZE=10.
You end your session.
Assuming histappend is not enabled, commands 41 to 50 are saved to yo...
Export database schema into SQL file
...
150
You can generate scripts to a file via SQL Server Management Studio, here are the steps:
Righ...
Is there are way to make a child DIV's width wider than the parent DIV using CSS?
...ocument flow:
.child {
width: 100vw;
position: relative;
left: calc(-50vw + 50%);
}
We set the width of the child element to fill the entire viewport width, then we make it meet the edge of the screen by moving it to the left by a distance of half the viewport, minus 50% of the parent element...
快速理解 高频对冲套利自动交易（程式化交易） - 更多技术 - 清泛网 - 专注...
...账户，每个账户都有15个左右不同价格、不同合约，总计50个左右的单，全部报出，且绝不出错（因为，每一单，都是头一天下午收盘后，整理好的，人工审核无误，软件里做了保存）。
我的电脑用了一款虚拟系统软件，可以很...
Foreign Key to multiple tables
...Id)
)
CREATE TABLE dbo.[Group]
(
ID int primary key,
Name varchar(50) NOT NULL,
PartyTypeId as cast(2 as tinyint) persisted,
foreign key (ID, PartyTypeId) references Party(PartyId, PartyTypeID)
)
CREATE TABLE dbo.[User]
(
ID int primary key,
Name varchar(50) NOT NULL,
...
Python Pandas: Get index of rows which column matches certain value
...e({'BoolCol': [True, False, False, True, True]},
index=[10,20,30,40,50])
In [53]: df
Out[53]:
BoolCol
10 True
20 False
30 False
40 True
50 True
[5 rows x 1 columns]
In [54]: df.index[df['BoolCol']].tolist()
Out[54]: [10, 40, 50]
If you want to use the index,
In [56]:...