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What is an NP-complete in computer science?
What is an NP-complete problem? Why is it such an important topic in computer science?
15 Answers
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ImportError: No Module Named bs4 (BeautifulSoup)
I'm working in Python and using Flask. When I run my main Python file on my computer, it works perfectly, but when I activate venv and run the Flask Python file in the terminal, it says that my main Python file has "No Module Named bs4." Any comments or advice is greatly appreciated.
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Where to get “UTF-8” string literal in Java?
I'm trying to use a constant instead of a string literal in this piece of code:
11 Answers
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How to retrieve a module's path?
I want to detect whether module has changed. Now, using inotify is simple, you just need to know the directory you want to get notifications from.
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Rename a dictionary key
Is there a way to rename a dictionary key, without reassigning its value to a new name and removing the old name key; and without iterating through dict key/value?
In case of OrderedDict, do the same, while keeping that key's position.
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Why does the indexing start with zero in 'C'?
Why does the indexing in an array start with zero in C and not with 1?
16 Answers
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How to exit from the application and show the home screen?
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Android's design does not favor exiting an application by choice, but rather manages it by the OS. You can bring up the Home application by its corresponding Intent:
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
inte...
Why are variables “i” and “j” used for counters?
...rom mathematics: the summation notation traditionally uses i for the first index, j for the second, and so on. Example (from http://en.wikipedia.org/wiki/Summation):
It's also used that way for collections of things, like if you have a bunch of variables x1, x2, ... xn, then an arbitrary one...
PostgreSQL: Which Datatype should be used for Currency?
... float like datatype to represent currency because if you do, people are going to be unhappy when the financial report's bottom line figure is incorrect by + or - a few dollars.
The money type is just left in for historical reasons as far as I can tell.
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Keyboard shortcut for Jump to Previous View Location (Navigate back/forward) in IntelliJ IDEA
... users, replace Ctrl with ⌘ (command) and Alt with ⌥ (option).
Update In v12.0 it's Alt + Shift +← (Left Arrow) instead of Alt + Ctrl + ← (Left Arrow).
Update 2 In v14.1 (and possibly earlier) it's Ctrl + [
Update 3 In IntelliJ IDEA 2016.3 it's Ctrl + Alt + ← (Left Arrow)
Update 4 ...