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What's the u prefix in a Python string?
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You're right, see 3.1.3. Unicode Strings.
It's been the syntax since Python 2.0.
Python 3 made them redundant, as the default string type is Unicode. Versions 3.0 through 3.2 removed them, but they were re-added in 3.3+ for compatibility with Python 2 to aide the 2 to 3...
Possible heap pollution via varargs parameter
... It refers to references which have a type that is not a supertype of the object they point to.
List<A> listOfAs = new ArrayList<>();
List<B> listOfBs = (List<B>)(Object)listOfAs; // points to a list of As
This can lead to "unexplainable" ClassCastExceptions.
// if the he...
How to cancel/abort jQuery AJAX request?
I've an AJAX request which will be made every 5 seconds. But the problem is before the AJAX request if the previous request is not completed I've to abort that request and make a new request.
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Any reason not to use '+' to concatenate two strings?
...ython is to concatenate a sequence of strings using + in a loop. This is bad because the Python interpreter has to create a new string object for each iteration, and it ends up taking quadratic time. (Recent versions of CPython can apparently optimize this in some cases, but other implementations ...
Signed versus Unsigned Integers
Am I correct to say the difference between a signed and unsigned integer is:
15 Answers
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App Inventor 2 列表代码块 · App Inventor 2 中文网
...出异常、报错。
如果给定列表是一个二维列表，如 [["abc","123"],["xyz","456"]] ，则返回的列表项也是一个列表对象，如 ["abc","123"]。
求对象在列表中的位置
返回指定对象在列表中的位置，从 1 开始，如果不在...
Is there any way to redraw tmux window when switching smaller monitor to bigger one?
...to a remote server over ssh with Terminal.app. When you "tmux attach" with bigger resolution monitor from smaller one you previously started tmux, it draws dots around the console. It doesn't fit the new window size. Is there any way to redraw and clean the window? CTRL + L or CTRL - B + R doe...
what is the basic difference between stack and queue?
What is the basic difference between stack and queue??
11 Answers
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Git cherry pick vs rebase
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Since the time git cherry-pick learned to be able to apply multiple commits, the distinction indeed became somewhat moot, but this is something to be called convergent evolution ;-)
The true distinction lies in original intent to create both tools:
git rebase's ta...
ImportError: Cannot import name X
...ector, entity and physics. I will not post all the code, just the imports, because I think that's where the error is. (If you want, I can post more)
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