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Difference between except: and except Exception as e: in Python
... you can use the infomration in the exception (type, message, stack trace, etc) to handle the exception in a more specially tailored manor.
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Why do x86-64 systems have only a 48 bit virtual address space?
...e IBM PC designated a section of that for memory mapped peripherals, BIOS, etc. Some other 8088/8086 designs (Zenith Z100, if memory serves) designated less for peripherals and such, and correspondingly more for application programs.
– Jerry Coffin
Jul 16 '11 a...
Do try/catch blocks hurt performance when exceptions are not thrown?
...atter, and use ArrayPool<byte> instead of just creating byte arrays, etc... In these scenarios what is the impact of multiple (perhaps nested) try catch blocks within the tight loop. Some optimizations will be skipped by the compiler also exception variable goes to Gen0 GC. All I am saying is ...
How do you run your own code alongside Tkinter's event loop?
...e python script once exiting the gui. Something like while app.is_alive(): etc
– m3nda
Dec 23 '19 at 12:59
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Generic type conversion FROM string
...ype(Type t, object value)
{
TypeConverter tc = TypeDescriptor.GetConverter(t);
return tc.ConvertFrom(value);
}
public static void RegisterTypeConverter<T, TC>() where TC : TypeConverter
{
TypeDescriptor.AddAttributes(typeof(T), new TypeConverterAttribu...
Setting environment variables on OS X
...variables that are available in all GUI applications, your only option is /etc/launchd.conf.
Please note that environment.plist does not work for applications launched via Spotlight. This is documented by Steve Sexton here.
Open a terminal prompt
Type sudo vi /etc/launchd.conf (note: this file mi...
How to watch for array changes?
...fer another solution... allowing you to intercept method calls, accessors, etc. Most importantly, you can do this without even providing an explicit property name... which would allow you to test for an arbitrary, index-based access/assignment. You can even intercept property deletion. Proxies would...
How to create an array containing 1…N
...alues by changing i+1 to expression required (e.g. i*2, -i, 1+i*2, i%2 and etc). If expression can be expressed by some function f then the first form becomes simply
[ ...Array(N).keys() ].map(f)
Examples:
Array.from({length: 5}, (v, k) => k+1);
// [1,2,3,4,5]
Since the array is initialize...
Slow Requests on Local Flask Server
...Chrome displayed the expected screen, but everything else hung (curl, ffx, etc) until I either reloaded or closed the Chrome tab, at which point everything else that was waiting around returned a result.
My best guess is that Chrome was trying to keep the session open and Flask was blocking the sub...
Can scrapy be used to scrape dynamic content from websites that are using AJAX?
...in-kazan.ru.
All messages are loaded with an AJAX request. My goal is to fetch these messages with all their attributes (author, date, ...):
When I analyze the source code of the page I can't see all these messages because the web page uses AJAX technology. But I can with Firebug from Mozilla Fi...