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Unique (non-repeating) random numbers in O(1)?
...esn't resort to something like an O(N) search of previous values to do it. Is this possible?
22 Answers
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Android 4.3 Bluetooth Low Energy unstable
...gy (testing on the Nexus 4). After getting started with the official BLE APIs in Android 4.3, I have noticed that after I connect a device for the first time I am rarely able to successfully connect to / communicate with that device or any other device again.
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How to call an external command?
...cess
subprocess.run(["ls", "-l"])
The advantage of subprocess vs. system is that it is more flexible (you can get the stdout, stderr, the "real" status code, better error handling, etc...).
The official documentation recommends the subprocess module over the alternative os.system():
The subpr...
How do browsers pause/change Javascript when tab or window is not active?
...ce tests that need to detect if people are paying attention or not. But, this question is not about the page visibility API .
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What is the difference between == and equals() in Java?
I wanted to clarify if I understand this correctly:
23 Answers
23
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How can I replace a newline (\n) using sed?
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Use this solution with GNU sed:
sed ':a;N;$!ba;s/\n/ /g' file
This will read the whole file in a loop, then replaces the newline(s) with a space.
Explanation:
Create a label via :a.
Append the current and next line to the pa...
Singletons vs. Application Context in Android?
Recalling this post enumerating several problems of using singletons
and having seen several examples of Android applications using singleton pattern, I wonder if it's a good idea to use Singletons instead of single instances shared through global application state (subclassing android.os.Applicat...
Sibling package imports
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Seven years after
Since I wrote the answer below, modifying sys.path is still a quick-and-dirty trick that works well for private scripts, but there has been several improvements
Installing the package (in a virtualenv or not) will give you what you want, though I would suggest using pip to ...
Detect URLs in text with JavaScript
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First you need a good regex that matches urls. This is hard to do. See here, here and here:
...almost anything is a valid URL. There
are some punctuation rules for
splitting it up. Absent any
punctuation, you still have a valid
URL.
Check the RFC carefull...
If unit testing is so great, why aren't more companies doing it? [closed]
... has low repeatibility and low chance of catching bugs. The other attitude is: it was something they wanted to get going with "in the future"; basically when money falls from the sky.
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