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How to delete a record in Django models?
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551
There are a couple of ways:
To delete it directly:
SomeModel.objects.filter(id=id).delete()
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深入理解 x86/x64 的中断体系 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
... interrupt handler 入口
IDT 表中 descriptor 类型的检查
使用 16-bit gate descriptor
IDT 表的 limit 检查
请求访问 interrupt handler 时的权限检查
gate 的权限设置
interrupt handler 的 code segment 权限设置
使用 interrupt gate
使用 trap gate
使用 ta...
SQL Add foreign key to existing column
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191
Error indicates that there is no UserID column in your Employees table. Try adding the column ...
Quick search on filename
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edited Aug 24 '14 at 12:48
Anton Dozortsev
4,25233 gold badges2929 silver badges6262 bronze badges
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count number of lines in terminal output
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491
Pipe the result to wc using the -l (line count) switch:
grep -Rl "curl" ./ | wc -l
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How to merge two sorted arrays into a sorted array? [closed]
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31 Answers
31
Active
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Symbol for any number of any characters in regex?
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241
.*
. is any char, * means repeated zero or more times.
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Run two async tasks in parallel and collect results in .NET 4.5
... {
Console.WriteLine("Starting");
var task1 = Sleep(5000);
var task2 = Sleep(3000);
int[] result = await Task.WhenAll(task1, task2);
Console.WriteLine("Slept for a total of " + result.Sum() + " ms");
}
private a...
Efficient way to apply multiple filters to pandas DataFrame or Series
...numpy) allow for boolean indexing, which will be much more efficient:
In [11]: df.loc[df['col1'] >= 1, 'col1']
Out[11]:
1 1
2 2
Name: col1
In [12]: df[df['col1'] >= 1]
Out[12]:
col1 col2
1 1 11
2 2 12
In [13]: df[(df['col1'] >= 1) & (df['col1'] <=1 )]
Out...