function-call

Why is a function/method call in python expensive?

A function call requires that the current execution frame is suspended, and a new frame is created and pushed on the stack. This is relatively expensive, compared to many other operations. You can measure the exact time required with the timeit module: >>> import timeit >>> def f(): pass … >>> timeit.timeit(f) 0.15175890922546387 That’s 1/6th … Read more

Converting list to *args when calling function [duplicate]

You can use the * operator before an iterable to expand it within the function call. For example: timeseries_list = [timeseries1 timeseries2 …] r = scikits.timeseries.lib.reportlib.Report(*timeseries_list) (notice the * before timeseries_list) From the python documentation: If the syntax *expression appears in the function call, expression must evaluate to an iterable. Elements from this iterable are … Read more

When passing variable to function I get ‘Invalid argument’, but when I hard code it works in Apps Script

When a function is called directly from the script editor/menu/button click/triggers, the following sequence of actions happens: First, Entire script is loaded and All global statements are executed. This is equivalent to loading a web page with all your script in script tags: <script>…code.gs..</script> The function you called is called. This is like adding callMyFunction() … Read more

What is the difference between parent.frame() and parent.env() in R; how do they differ in call by reference?

parent.env is the environment in which a closure (e.g., function) is defined. parent.frame is the environment from which the closure was invoked. f = function() c(f=environment(), defined_in=parent.env(environment()), called_from=parent.frame()) g = function() c(g=environment(), f()) and then > g() $g <environment: 0x14060e8> $f <environment: 0x1405f28> $defined_in <environment: R_GlobalEnv> $called_from <environment: 0x14060e8> I’m not sure when a mere … Read more

Call external javascript functions from java code

Use ScriptEngine.eval(java.io.Reader) to read the script ScriptEngineManager manager = new ScriptEngineManager(); ScriptEngine engine = manager.getEngineByName(“JavaScript”); // read script file engine.eval(Files.newBufferedReader(Paths.get(“C:/Scripts/Jsfunctions.js”), StandardCharsets.UTF_8)); Invocable inv = (Invocable) engine; // call function from script file inv.invokeFunction(“yourFunction”, “param”);

Using print() (the function version) in Python2.x

Consider the following expressions: a = (“Hello SO!”) a = “Hello SO!” They’re equivalent. In the same way, with a statement: statement_keyword(“foo”) statement_keyword “foo” are also equivalent. Notice that if you change your print function to: print(“Hello”,”SO!”) You’ll notice a difference between python 2 and python 3. With python 2, the (…,…) is interpteted as … Read more