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Filter by property
... them:
With a Manager:
class CompanyManager(models.Manager):
def with_chairs_needed(self):
return self.annotate(chairs_needed=F('num_employees') - F('num_chairs'))
class Company(models.Model):
# ...
objects = CompanyManager()
Company.objects.with_chairs_needed().filter(chairs...
How can I troubleshoot my Perl CGI script?
...ironment)
is considered tainted. Environment variables such as PATH and
LD_LIBRARY_PATH
are particularly troublesome. You have to set these to a safe value
or unset them completely, as I recommend. You should be using absolute
paths anyway. If taint checking complains about something else,
make ...
PowerShell script to return versions of .NET Framework on a machine?
...up\NDP' -recurse |
Get-ItemProperty -name Version,Release -EA 0 |
Where { $_.PSChildName -match '^(?!S)\p{L}'} |
Select PSChildName, Version, Release
Based on the MSDN article, you could build a lookup table and return the marketing product version number for releases after 4.5:
$Lookup = @{
...
Set breakpoint in C or C++ code programmatically for gdb on Linux
...
in Windows, MSVC you can use __debug_break, DebugBreak or _asm {int 3}.
– Fernando Gonzalez Sanchez
Jan 27 '15 at 1:11
...
Python JSON serialize a Decimal object
...
The problem was that DecimalEncoder()._iterencode(decimal.Decimal('3.9')).next() returned the correct '3.9', but DecimalEncoder()._iterencode(3.9).next() returned a generator object which would only return '3.899...' when you piled on another .next(). Generator f...
Sphinx autodoc is not automatic enough
...posed to output the files to? I tried outputting them to Sphinx's default _build folder, but running sphinx-build -b html . ./_build doesn't pick them up.
– Cerin
Jan 6 '11 at 18:13
...
Run an Application in GDB Until an Exception Occurs
...case of GNU C++, exceptions are raised by calling a library function named __raise_exception which has the following ANSI C interface:
/* addr is where the exception identifier is stored.
id is the exception identifier. */
void __raise_exception (void **addr, void *id);
To make the debugger c...
C++中判断文件、目录是否存在的几种方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
if(fh == NULL)
{
printf("%s","can not open the file");
}
三、_access
当然C中还有一种方式是直接调用c的函数库。
就是函数 int _access(const char* path,int mode);
这个函数的功能十分强大。
可以看看msdn的详细介绍
#include <io.h>
#include ...
What is the difference between shallow copy, deepcopy and normal assignment operation?
... @grc But I have tried an example(I remove the new line here.) list_=[[1,2],[3,4]] newlist = list_.copy() list_[0]=[7,8] print(list_) print(newlist) The newlist still display [[1, 2], [3, 4]]. But list_[0] is a list which is mutable.
– Alston
Nov 12 '16...
Slow Requests on Local Flask Server
...sk run --with-threads which solved my problem.
– arno_v
Apr 13 '18 at 11:33
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