What’s the purpose of git-mv?
is just shorthand for: i.e. it updates the index for both old and new paths automatically.
What are the benefits to marking a field as `readonly` in C#?
The readonly keyword is used to declare a member variable a constant, but allows the value to be calculated at runtime. This differs from a constant declared with the const modifier, which must have its value set at compile time. Using readonly you can set the value of the field either in the declaration, or in the constructor of the object … Read more
Is #include bad practice?
Msdn documentation explicitly tells you (a) in which header file a function is declared and (b) which header file you are supposed to include. Most functions tell you to include windows.h, for example SendMessage Some function, that were added later or have very specific use cases, are only available through other header files, for example SetupDiEnumDeviceInfo. So no, … Read more
No module named ‘psycopg2’
There is a possibility that you have two versions of python installed and python2-pip is aliased as pip while python3-pip is aliased as pip3. Make sure you are using right version with python and pip. So the command would be:
Alternative to itoa() for converting integer to string C++?
In C++11 you can use std::to_string: If you’re working with prior to C++11, you could use C++ streams: Taken from http://notfaq.wordpress.com/2006/08/30/c-convert-int-to-string/
PHP “php://input” vs $_POST
The reason is that php://input returns all the raw data after the HTTP-headers of the request, regardless of the content type. The PHP superglobal $_POST, only is supposed to wrap data that is either application/x-www-form-urlencoded (standard content type for simple form-posts) or multipart/form-data (mostly used for file uploads) This is because these are the only content types that must be supported by user agents. … Read more
TypeError: ‘float’ object not iterable
for i in count: means for i in 7:, which won’t work. The bit after the in should be of an iterable type, not a number. Try this:
How can I do a FULL OUTER JOIN in MySQL?
You don’t have full joins in MySQL, but you can sure emulate them. For a code sample transcribed from this Stack Overflow question you have: With two tables t1, t2: The query above works for special cases where a full outer join operation would not produce any duplicate rows. The query above depends on the UNION set operator to remove duplicate rows introduced by the query pattern. … Read more
Error in colMeans(x, na.rm = TRUE) : ‘x’ must be numeric in KNN classification
‘Color’ is a factor. kNN only takes numeric inputs. You can turn your Color variable into a numeric variable or just remove Color entirely.
Why is the gets function so dangerous that it should not be used?
In order to use gets safely, you have to know exactly how many characters you will be reading, so that you can make your buffer large enough. You will only know that if you know exactly what data you will be reading. Instead of using gets, you want to use fgets, which has the signature (fgets, if it reads … Read more