function

问题 I'm trying to learn python (with my VBA background) buy building a black-jack game as a pedagogical exercise. I've done some searches about passing multiple arguments but I really don't understand what i'm finding in the way of explanations. Looking at the last function called 'hand' i'm trying to make use of three separate values passed as a 'return' from a previous function. I get the following error: Traceback (most recent call last): File "decky15.py", line 56, in <module> print hand(deal

问题 What is the best practice in python to check if at least one of the default parameters of the function is specified? Let's suppose we have some function: def some_function(arg_a=None, arg_b=None, arg_c=False) with some default parameters. In my case, I need to check if either arg_a or arg_b is specified. So I thought of implementing something like this: def some_function(arg_a=None, arg_b=None, arg_c=False): ... if arg_a is not None: ... elif arg_b is not None: ... else: raise ValueError(

问题 I am trying out functions and triggers int postgreSQL, however i am having a problem, when the function is triggered it is giving me an error ERROR: control reached end of trigger procedure without RETURN this particular procedure is only executing an insert into command so i do not see why it needs a return this is the script: CREATE OR REPLACE FUNCTION forest_aud_func() returns trigger as $tree_stamp$ BEGIN insert into Audit values('k',124,'l'); END; $tree_stamp$ LANGUAGE plpgsql; create

问题 I have a function similar to this one: isGoodNumber <- function(X) { if (X==5) return(TRUE) else return(FALSE) } I have a vector: v<-c(1,2,3,4,5,5,5,5) I want to obtain a new vector that contains the elements of v where isGoodNumber(v) == TRUE How do I do this ? Tried v [ isGoodNumber(v) == TRUE ] but it doesn't work :-) Thanks !! 回答1: You'll need to Vectorize the function to call it on a vector: isGoodNumber = Vectorize(isGoodNumber) v[isGoodNumber(v)] 回答2: There is a function named "Filter"

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 9 days ago . Improve this question i experienced this questions in a during the job interview, but i cant answered it and i cant find the answer after. They asked me 'Why methods return just one kind of parameter in normal conditions in C#? (ref-out is extra way to return multiple

问题 I have a file my_module.py that looks like this: from copy import deepcopy from my_other_module import foo def bar(x): return deepcopy(x) I want to get a list of all the functions defined in my_module and not the imported ones, in this case just [bar] , not deepcopy or foo . 回答1: You can use inspect.getmembers with inspect.isfunction and then get all the functions whose .__module__ property is the same as the module's .__name__ : from inspect import getmembers, isfunction from my_project

问题 I am trying to transition from pure JavaScript to jQuery. I have a for loop that dynamically creates HTML elements with data from an API. Here is my old code: recipeDiv = []; recipeDiv[i] = document.createElement("div"); recipeDiv[i].setAttribute("class", "recipeBlock"); recipeDiv[i].appendChild(someElement); However, when I transitioned to jQuery and used this instead recipeDiv = []; recipeDiv[i] = $("<div/>").addClass("recipeBlock"); recipeDiv[i].appendChild(someElement); I get the

问题 I am looking to build a function that creates a rolling total by code by day for the below DataFrames, where the In for each code on a date is subtracted from the Out for each code on a date, this subtotal is the subtracted from the previous days total but the total must be >=0 ( I have included an example of this it the Desired Output below). Below are an example of my inputs and the function I am using along with an example of my desired output. df1 - In s = """ Date Code Quantity 0 10/01

问题 I want to call MessageBox() function in such way: 1). load needed library 2). get the function address 3). call it So, for such aim as I understand, I should define new type with all types of arguments in MessageBox function. It returnes INT and accepts: HWND, LPCSTR, LPCSTR, UNIT. So I registred new type: typedef int(__stdcall *msgbox)(HWND, LPCSTR, LPCSTR, UINT); I have problems with calling such function. Does such way work for all functions or only for exported? How can I call MessageBox

问题 I want to call MessageBox() function in such way: 1). load needed library 2). get the function address 3). call it So, for such aim as I understand, I should define new type with all types of arguments in MessageBox function. It returnes INT and accepts: HWND, LPCSTR, LPCSTR, UNIT. So I registred new type: typedef int(__stdcall *msgbox)(HWND, LPCSTR, LPCSTR, UINT); I have problems with calling such function. Does such way work for all functions or only for exported? How can I call MessageBox