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Is null an Object?
...ype null
According to OpenJDKs 12.0.1 javac it is:
true.toString(); // error: boolean cannot be dereferenced
null.toString(); // error: <null> cannot be dereferenced
Where the angle brackets imply that null is of an other than a primitive type. And according to JLS 4.1:
There are tw...
How do I uninstall a Windows service if the files do not exist anymore?
... experience "The specified service does not exist as an installed service" error, although you see the service at the MMC!!! This is because the name you see is the DisplayName. You may lookup the actual service name at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services tree and pass that as servi...
Spark java.lang.OutOfMemoryError: Java heap space
...r) The following is also indicative of this problem:
java.lang.OutOfMemoryError : GC overhead limit exceeded
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Step-by-step debugging with IPython
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You can use IPython's %pdb magic. Just call %pdb in IPython and when an error occurs, you're automatically dropped to ipdb. While you don't have the stepping immediately, you're in ipdb afterwards.
This makes debugging individual functions easy, as you can just load a file with %load and then ru...
Create a Date with a set timezone without using a string representation
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It also can cause errors in the time values, near the daylight saving time transitions of the local time zone. In short, epoch shifting (via any implementation) does not work with the JavaScript Date object. Another way to see this here is t...
How to simulate Server.Transfer in ASP.NET MVC?
...ng this little gem you can do
// in an action method
TransferToAction(MVC.Error.Index());
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The Difference Between Deprecated, Depreciated and Obsolete [closed]
...ature still works in the current version of the software, but it may raise error messages or warnings recommending an alternate practice.
The Obsolete attribute marks a program entity as one that is no longer recommended for use. Each use of an entity marked obsolete will subsequently generate a wa...
How to overcome TypeError: unhashable type: 'list'
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As indicated by the other answers, the error is to due to k = list[0:j], where your key is converted to a list. One thing you could try is reworking your code to take advantage of the split function:
# Using with ensures that the file is properly closed when you'...
How to check if a variable is a dictionary in Python?
...ing works here, just wrap for k,v in ele.items() in try...except (AttributeError, TypeError). If exception is raised, you know ele has no items that yields an iterable...
– cowbert
Jul 14 '18 at 3:31
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关于php的socket初探 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...(__CLASS__, 'ev_read'), array(__CLASS__, 'ev_write'), array(__CLASS__, 'ev_error'), $id);
event_buffer_base_set($buffer, $base);
event_buffer_timeout_set($buffer, 30, 30);
event_buffer_watermark_set($buffer, EV_READ, 0, 0xffffff);
event_buffer_priority_set($buffer, 10);
event_buffer_enable...