iter(x) will raise a TypeError if x cannot be iterated on — but that check “accepts” sets and dictionaries, though it “rejects” other non-sequences such as None and numbers. On the other hands, strings (which most applications want to consider “single items” rather than sequences) are in fact sequences (so, any test, unless specialcased for … Read more
OK, this is a very old question, which I’m first seeing now. You’ll need to differentiate between sequence numbers and unique IDs that are (optionally) loosely sortable by a specific criteria (typically generation time). True sequence numbers imply knowledge of what all other workers have done, and as such require shared state. There is no … Read more
Once again, it seems I’ve answered my own question by getting impatient and asking it in #clojure on Freenode. Good thing answering your own questions is encouraged on Stackoverflow.com 😀 I had a quick discussion with Rich Hickey, and here is the gist of it. [12:21] <Raynes> Vectors aren’t seqs, right? [12:21] <rhickey> Raynes: no, … Read more
There is lots of information about the Fibonacci Sequence on wikipedia and on wolfram. A lot more than you may need. Anyway it is a good thing to learn how to use these resources to find (quickly if possible) what you need. Write Fib sequence formula to infinite In math, it’s given in a recursive … Read more
The following query gives names of all sequences. SELECT c.relname FROM pg_class c WHERE c.relkind = ‘S’; Typically a sequence is named as ${table}_id_seq. Simple regex pattern matching will give you the table name. To get last value of a sequence use the following query: SELECT last_value FROM test_id_seq;