for-loop

问题 For example, I have a list a . When I do it in a for loop, I can print all of its elements. But when I do it outside of the for loop, it only prints the last one. How can I print them all outside the for loop? Thanks in advance. Code: a=['a is apple','b is banana','c is cherry'] for i in a: print(i) print("====================") print(i) It prints: a is apple b is banana c is cherry ==================== c is cherry What I want for the result is: a is apple b is banana c is cherry ============

问题 I have a strong background in Matlab, and I am trying to switch to python. I am trying to write a nested for loop with numpy array and storing output values. My code reads like: import numpy as np import math # T parameter kk = np.arange(0, 20, 0.1) print(len(kk)) # V parameter pp = np.arange(1, 5, 1) print(len(pp)) a = len(kk) b = len(pp) P = np.zeros((a,b)) for T in kk: print(T) for V in pp: print(V) P = math.exp(-T*V/10) print(P) Explanation/Question kk , pp are the vectors. In for loop(s)

问题 I have an excel file & I Processed that file for Data Analysis and Created a Data Frame(Pandas). Now I Need to Get the result , I'm trying to get it through iterating over pandas columns and rows using for & if Condition But I'm not getting desired output. I've Taken hyphen(-) in excel file so that I can apply some conditions. Excel File Input_File Required Output A -> B -> C -> E -> I F -> G ->L H -> J -> K A1 -> B1 C1 -> A1 Z -> X Note: Saving Output in Text file in plain. No need of Graph

问题 I have created one dialog to evaluate our company consultant in our chatbot (C# botframework), but I can't use for or foreach inside of AdaptiveCard. I need to create one TextBlock() and one ChoiceSet() block for each item from List Pergunta, but I can't do it with foreach. Any suggestion or better idea to create this loop ? Here is my complete dialog code in C#. using System; using System.Threading.Tasks; using Microsoft.Bot.Builder.Dialogs; using Microsoft.Bot.Connector; using System

问题 As the title suggests I wanted to enumerate the key and its values (without brackets) in python. I tried the following code : example_dict = {'left':'<','right':'>','up':'^','down':'v',} [print(i,j,a) for (i,j,a) in enumerate(example_dict.items())] But it doesn't work. I want the output to be like this 0 left < 1 right > 2 up ^ 3 down v Thank you in advance 回答1: In this case enumerate returns (index, (key, value)) , so you just need to change your unpacking to for i, (j, a) , though

问题 I'm taking on a programming challenge for practice and I'm having trouble figuring this one out. It might be due to the time and my current sleepiness, but I want to get this done before bed. I want to sort the values of each element of an array in ascending order. The trick is not to use a sort() method. Here is what I have so far: for (int i = 0; i < freq_array.Length; i++) { for (int n = 1; n < i; n++) { if (freq_array[n] < freq_array[i]) freq_array[i] = freq_array[n]; } } for (int x = 0;

问题 I am a beginner in R. I am working on linear programming using R studio's Cplex to solve a model. One of the constraint in my model is Xl(i,j,t) <= D(i,j,t). I am able to do this with nested for loop with a small dimension (16X16X6). But I want to run my model a lot bigger model, more like 2500X2500X60. I need to save memory and run it faster than the nested for loop. I thought about using apply but I don't know how to make it work. Any help would be greatly appreciated! location <-16 horizon

问题 This question already has answers here : Multiple aggregations of the same column using pandas GroupBy.agg() (3 answers) Closed 9 months ago . I have a dataframe with individuals who called a variety of numbers. As so: Person Called A 123 B 123 C 234 I need to create a new dataframe that makes a list of people who called that number and the count. Like this: Persons Called Count A, B 123 2 C 234 1 I'm pretty sure I can just create a for loop that counts the number of times and appends them to

问题 Can anybody explain to me how this casue an infinite loop? I got this from an example of a javascript book. The code is as follows: function foo() { function bar(a) { i = 3; // changing the `i` in the enclosing scope's for-loop console.log( a + i ); } for (var i=0; i<10; i++) { bar( i * 2 ); // oops, inifinite loop ahead! } } foo(); 回答1: The problem is, that you're changing i from the for-loop inside your bar function i = 3; That means outside of bar it can't reach the condition i < 10 . So

问题 When I use simple for loop, addEventListener works well in for loop. But when I use for-in loop, it makes error like Uncaught TypeError: checklist[i].addEventListener is not a function This is my work-well code. var checklist = document.querySelectorAll(".checklist"); for (var i = 0, len = checklist.length; i < len; i += 1) { checklist[i].addEventListener('change', function (event) { alert('test'); }); } This is my Error code. var checklist = document.querySelectorAll(".checklist"); for (var