...a few rules, and the IEnumerator implementation is generated automatically by the compiler. An iterator block is a regular function that (a) returns IEnumerator, and (b) uses the yield keyword. So what does the yield keyword actually do? It declares what the next value in the sequence is – or...

...error occurs, the first thing that I usually do is look at the stack trace by calling traceback(): that shows you where the error occurred, which is especially useful if you have several nested functions. Next I will set options(error=recover); this immediately switches into browser mode where the ...

...e mainly used for future reference to the specific version of the project, by tagging a commit. You can always use branches of course, but if you change versions a lot, you will end up with lots of unused or rarely used branches. Practically, tags are branches without branches anyway, just adding a...

...or this purpose. On a 4 processor machine it improved the sort performance by 100% ! #! /bin/ksh MAX_LINES_PER_CHUNK=1000000 ORIGINAL_FILE=$1 SORTED_FILE=$2 CHUNK_FILE_PREFIX=$ORIGINAL_FILE.split. SORTED_CHUNK_FILES=$CHUNK_FILE_PREFIX*.sorted usage () { echo Parallel sort echo usage: ps...

...d, but it is marked as "not used". It was in the original JVM (see answer by @VitaliiFedorenko), but then removed. It was probably kept as a reserved keyword in case it were to be added to a later version of Java. If goto was not on the list, and it gets added to the language later on, existing co...

... care about the order of the entries and want to access the keys or values by index anyway, you can use d.keys()[i] and d.values()[i] or d.items()[i]. (Note that these methods create a list of all keys, values or items in Python 2.x. So if you need them more then once, store the list in a variable...

...n the server on a per-connection basis. This means that the value returned by the function to a given client is the first AUTO_INCREMENT value generated for most recent statement affecting an AUTO_INCREMENT column by that client. So the value returned by LAST_INSERT_ID() is per user and is unaffec...

...ce of memory that you allocate once and then use to manage memory manually by handing out parts of that memory. For example: char * arena = malloc(HUGE_NUMBER); unsigned int current = 0; void * my_malloc(size_t n) { current += n; return arena + current - n; } The point is that you get full cont...

... psql -d template1 works for you is that template1 is a database created by postgres itself, and is present on all installations. You are apparently able to log in to template1, so you must have some rights assigned to you by the database. Try this at a shell prompt: createdb and then see if y...

...tem-type-{{item.type}}" on a directive with an isolate scope will not work by default, but works fine on one with a child scope because whatever is interpolated can still by default be found in the parent scope. Also, the directive itself can safely evaluate attributes and expressions in the context...