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Removing duplicates from a list of lists
...pby(k))
[[1, 2], [3], [4], [5, 6, 2]]
itertools often offers the fastest and most powerful solutions to this kind of problems, and is well worth getting intimately familiar with!-)
Edit: as I mention in a comment, normal optimization efforts are focused on large inputs (the big-O approach) becaus...
Relative URLs in WordPress
... is much more convenient for switching domain names, changing between http and https etc. Today I discovered that if you define WP_CONTENT_URL with a relative url then when you insert files into posts they use the relative url for the src instead of absolute url. Just what I've always wanted! But th...
Is < faster than
...n two machine instructions:
A test or cmp instruction, which sets EFLAGS
And a Jcc (jump) instruction, depending on the comparison type (and code layout):
jne - Jump if not equal --> ZF = 0
jz - Jump if zero (equal) --> ZF = 1
jg - Jump if greater --> ZF = 0 and SF = OF
(etc...)
Exa...
Difference between assertEquals and assertSame in phpunit?
...
Reports an error identified by $message if the two variables $expected and $actual do not have the same type and value."
And as you can see in the example below the above excerpt, they are passing '2204' and 2204, which will fail using assertSame because one is a string and one is an int, basi...
Why .NET String is immutable? [duplicate]
...ow, String is immutable. What are the reasons for String being immutable and the introduction of StringBuilder class as mutable?
...
How to skip over an element in .map()?
...tion would have kept it.
update — This question gets a lot of attention, and I'd like to add the following clarifying remark. The purpose of .map(), as a concept, is to do exactly what "map" means: transform a list of values into another list of values according to certain rules. Just as a paper m...
What is a NullPointerException, and how do I fix it?
What are Null Pointer Exceptions ( java.lang.NullPointerException ) and what causes them?
12 Answers
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Very large matrices using Python and NumPy
NumPy is an extremely useful library, and from using it I've found that it's capable of handling matrices which are quite large (10000 x 10000) easily, but begins to struggle with anything much larger (trying to create a matrix of 50000 x 50000 fails). Obviously, this is because of the massive memo...
Failed to Attach to Process ID Xcode
...
Resetting the content and settings in the simulator worked for me. This is available in the "iOS Simulator" menu.
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Getting “type or namespace name could not be found” but everything seems ok?
... when an application is set to target the .Net 4 Client Profile framework, and the project it references targets the full .Net 4 framework.
So to make that clearer:
Project A targets the Client Profile framework
Project A references Project B
Project B targets the full framework
The solution in...