This is usually called maplist/3 and is part of the Prolog prologue. Note the different argument order! :- meta_predicate(maplist(2, ?, ?)). maplist(_C_2, [], []). maplist( C_2, [X|Xs], [Y|Ys]) :- call(C_2, X, Y), maplist( C_2, Xs, Ys). The different argument order permits you to easily nest several maplist-goals. ?- maplist(maplist(test),[[1,2],[3,4]],Rss). Rss = [[1,4],[9,16]]. maplist comes in … Read more
Use replace instead of map: >>> s = pd.Series([‘one’,’two’,’three’,’four’]) >>> recodes = {‘one’:’A’, ‘two’:’B’, ‘three’:’C’} >>> s.map(recodes) 0 A 1 B 2 C 3 NaN dtype: object >>> s.replace(recodes) 0 A 1 B 2 C 3 four dtype: object
Almost all numpy functions operate on whole arrays, and/or can be told to operate on a particular axis (row or column). As long as you can define your function in terms of numpy functions acting on numpy arrays or array slices, your function will automatically operate on whole arrays, rows or columns. It may be … Read more
You can use reduce() and add to array e+1, e+2 of each element. var ar = [3, 16, 120]; var result = ar.reduce(function(r, e) { r.push(e+1, e+2); return r; }, []); console.log(result) This is ES6 version with arrow function var ar = [3, 16, 120]; var result = ar.reduce((r, e) => r.push(e+1, e+2) && r, … Read more
Use functools.partial(): from functools import partial mapfunc = partial(my_function, ip=ip) map(mapfunc, volume_ids) partial() creates a new callable, that’ll apply any arguments (including keyword arguments) to the wrapped function in addition to whatever is being passed to that new callable.
There are lots of ways you could mean this. If you just want to panic, use .map(|x| x.unwrap()). If you want all results or a single error, collect into a Result<X<T>>: let results: Result<Vec<i32>, _> = result_i32_iter.collect(); If you want everything except the errors, use .filter_map(|x| x.ok()) or .flat_map(|x| x). If you want everything up … Read more
You can use std::back_inserter in <iterator>, although providing the size in front is more efficient. For example: string str = “hello world!”, result; transform(str.begin(), str.end(), back_inserter(result), ::toupper); // result == “HELLO WORLD!”
You can use std::back_inserter in <iterator>, although providing the size in front is more efficient. For example: string str = “hello world!”, result; transform(str.begin(), str.end(), back_inserter(result), ::toupper); // result == “HELLO WORLD!”
I had a task that I only knew the length of the array and needed to transform the items. I wanted to do something like this: let arr = new Array(10).map((val,idx) => idx); To quickly create an array like this: [0,1,2,3,4,5,6,7,8,9] But it didn’t work because: (see Jonathan Lonowski’s answer) The solution could be to … Read more
You can use functools.partial for this (as you suspected): from functools import partial def target(lock, iterable_item): for item in iterable_item: # Do cool stuff if (… some condition here …): lock.acquire() # Write to stdout or logfile, etc. lock.release() def main(): iterable = [1, 2, 3, 4, 5] pool = multiprocessing.Pool() l = multiprocessing.Lock() func … Read more