function

问题 I have a list like [2,3,4,5] and i want square of these number using python function Have tried below Python code def square(list=[]): for i in list: new_value=[] new_value.append(i**2) return new_value I get the square of only first entry in a list. square(2,3,4) 回答1: List comprehension makes this function a single liner and much clearer. def square(x): return [y**2 for y in x] 回答2: Your method square is initialising new_value for every element in the list, and also your return is

问题 I'm adding some html dynamically to my page. I have add this <a [routerLink]="[]" class="image-fav" (click)="imageDel()">CLICK-ME</a> Click on this hyperlink should call the imageDel function but it does not do so. If I add this html to component template straight everything works fine. How can I fix this problem ? 回答1: Angular doesn't understand the events of dynamically added elements. One workaround would be to use ElementRef 's querySelector function to add the event handler. Try the

问题 I'm adding some html dynamically to my page. I have add this <a [routerLink]="[]" class="image-fav" (click)="imageDel()">CLICK-ME</a> Click on this hyperlink should call the imageDel function but it does not do so. If I add this html to component template straight everything works fine. How can I fix this problem ? 回答1: Angular doesn't understand the events of dynamically added elements. One workaround would be to use ElementRef 's querySelector function to add the event handler. Try the

问题 I'm attempting to write a function to run all possible regression models for variables in a dataset. I was able to get it to run each variable, this is what I have so far. library(tidyverse) library(broom) data("mtcars") model1 <- function (DATA) { DATA %>% map(~lm(mpg ~ .x, data = DATA), tidy)%>% map(summary) %>% map_dbl("adj.r.squared") %>% tidy %>% rename(adj.r.squared = x) } model1(mtcars) I am new to R and writing functions so I am sure there are some issues with it. I want a tibble of

问题 I have a list made of lists, to create a matrix, mostly filled with zeros and some other numbers like this a = [[0,0,0,1,0,0,0,0], [3,0,0,2,1,0,0,0], [3,0,0,0,0,1,0,0], [3,5,0,4,0,0,0,0]] how could I make a function that takes that variable, and find if there is a number repeated 3 times in the diagonals? For example that It returns True because of the 1. I tried to implement a function like this: def find_diagonal(matriz): for x in range(len(matrix)): for for a in range(len(x)): if matriz[x]

问题 What is the best way to find all function calls that a function makes? I want to do this at runtime (likely with a decorator). Is the best way to retrieve the source code with inspect (this means that I will have to have access to the source code...so no interactive interpreter support) and then parse it with ast ? Is there a better way? Python 2.7 preferred, but not required. I'd like it to be simple enough to do myself. If others have done it, I would look at the source code so I could

问题 What is the best way to find all function calls that a function makes? I want to do this at runtime (likely with a decorator). Is the best way to retrieve the source code with inspect (this means that I will have to have access to the source code...so no interactive interpreter support) and then parse it with ast ? Is there a better way? Python 2.7 preferred, but not required. I'd like it to be simple enough to do myself. If others have done it, I would look at the source code so I could

问题 Basically I understand that .filter() , .reduce() , and .map() are higher-order functions because they take other functions as their arguments, like this: arrayOfWords.filter(words => words.length > 6); unflattenedArray.reduce((accumulator, currentValue) => accumulator + currentValue); arrayOfIntegers.map(x => x * 2); So then is .findIndex() also a higher-order function? Seems to operate just like the others: let fruits = ["apple", "banana", "cantaloupe", "blueberries", "grapefruit"]; let

问题 This question already has answers here : Division result is always zero [duplicate] (4 answers) Closed 5 years ago . I know you're usually not meant to put out all of your code but this is short and would help with the problem. Can anyone please explain why the output is 0 and how I can change the code to output what should be the volume of a cone. #include <stdio.h> float ConeVolume(int height, int radius); float ConeVolume(int height, int radius) { float pi; pi = 3.14159; float third; third

问题 So I have a currency which is increasing (that system is working fine). The first part updates the label every 100 ms. I have another button which triggers the second function which is supposed to clear the labels from the first. It sets home_status equal to 0 which should in theory run Money.place_forget() to clear the code. I have tested each part individually and it works but when I put the clears inside the elif statement it doesn't. It does not give me any errors, it just simply doesn't