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How to use filter, map, and reduce in Python 3
... longer return lists:
[...]
map() and filter() return iterators. If you really need a list, a quick fix is e.g. list(map(...)), but a better fix is often to use a list comprehension (especially when the original code uses lambda), or rewriting the code so it doesn’t need a list at all. Particular...
What is the formal difference in Scala between braces and parentheses, and when should they be used?
...ut this, but I gave up in the end, as the rules are somewhat diffuse. Basically, you’ll have to get the hang of it.
Perhaps it is best to concentrate on where curly braces and parenthesis can be used interchangeably: when passing parameters to method calls. You may replace parenthesis with curly b...
Oracle SELECT TOP 10 records
... '06.02.2009')
If HISTORY_DATE really is a date column and if it has an index then this rewrite will perform better:
WHERE HISTORY_DATE = TO_DATE ('06.02.2009', 'DD.MM.YYYY')
This is because a datatype conversion disables the use of a B-Tree index.
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How to call Base Class's __init__ method from the child class? [duplicate]
... If you pass BaseClass to super, it'll skip over BaseClass and call object.__init__, which is almost certainly not what you want.
– abarnert
Oct 6 '13 at 7:29
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MySQL convert date string to Unix timestamp
...with MySQL:
http://www.epochconverter.com/programming/mysql-from-unixtime.php
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Any good, visual HTML5 Editor or IDE? [closed]
... > Enter Project name
Create New HTML File
Name to index.html
Select Properties of HTML File
Hit Ctrl+Space
similarly create new *.css file
Right Click on the css file > Properties > Web Content Settings > Select CSS3 Profile > ok Hit CTRL...
Why does the C preprocessor interpret the word “linux” as the constant “1”?
Why does the C preprocessor in GCC interpret the word linux (small letters) as the constant 1 ?
5 Answers
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How to clear the interpreter console?
Like most Python developers, I typically keep a console window open with the Python interpreter running to test commands, dir() stuff, help() stuff , etc.
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How to add include path in Qt Creator?
... line. Really all this does is tell Qt Creator where to look for files to index for auto completion. Your own build system will have to handle the include paths in its own way.
As explained in the Qt Creator Manual, <your path> must be an absolute path, but you can avoid OS-, host- or user-...
Java 8 List into Map
... brevity contest. The Guava alternative looks so much readable: Maps.uniqueIndex(choices, Choice::getName).
– Bogdan Calmac
Mar 3 '15 at 17:59
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