instances

问题 I have a polynomial class: class Polynomial: def __init__(self, *termpairs): self.termdict = dict(termpairs) To add an instance to this class, you enter the following: P = Polynomial((3,2), (4,5), (9,8)) Now I'm trying to create a function that reads information from a text file, and from that text file, it creates an instance of the Polynomial class. The information is stored in the text file like this: 4 6 2 3 9 8 3 5 0 42 So far, the function looks like this: def read_file(polyfilename):

问题 few days ago, when I was debugging an Android project under eclipse I've found some great functionality: "All instances..." and "Instance count". I wanted to share my findings with rest of my colleagues, but none of them had this functionality in their eclipse install (we all use eclipse 3.7). What's even more weird now I'm also missing this functionality. As far as I can tell this functionality is build within eclipse from version 3.3 and available to projects using Java 1.6 and above as

问题 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 7 years ago . I asked a question a couple of days ago about populating a listbox on a form from a class. It works and was great! However I now want to do the same with a textbox or a label. The answer from that question is

问题 I just started to learn about classes last week in my game dev. class. I am trying to create something that will allow me to create instances of something while in a for loop. For example, I am trying to create 5 instances of Player in a loop and use an ID number that will increase with each time the loop loops. I've gotten this far. class Player(object): def __init__(self, nm, am, wp, ht, ide): self.name = nm self.ammo = am self.weapon = wp self.health = ht self.id = ide def __str__(self):

问题 I'm trying to accomplish something that was simple to do before in GCE with scratch disks. Basically I want to start an instance (now using a newly created root persistent disk), have the instance run some computation, then have the instance kill itself AND delete the root persistent disk. This was easy before the V1 api because you could use a scratch disk that disappeared when the instance was killed, however, now with V1, deleting an instance with a root persistent disk requires two calls

问题 In our Rails 4 app, there are four models: class User < ActiveRecord::Base has_many :administrations, dependent: :destroy has_many :calendars, through: :administrations end class Administration < ActiveRecord::Base belongs_to :user belongs_to :calendar end class Calendar < ActiveRecord::Base has_many :administrations, dependent: :destroy has_many :users, through: :administrations end class Post < ActiveRecord::Base belongs_to :calendar end Here are the corresponding migrations: class

问题 I have two java web applications running on two instances of tomcat 7 on same windows machine. One application is running on port 9080 and another on 9090. I log into both applications using 2 tabs in the SAME browser. When I logout from one application (e.g application on 9080) I get logged out from other application (running on 9090) also. Need help. Thanks 回答1: You possibly have not done the correct configuration for the web container. Go through this First configure the web container and

问题 i am looking for some help with counting the number of occurences in multiple rows of a mysql db.the purpose is for creting a search engine like google but only for my website the scheme is to display the entry which has the most number of occurences of the word at the very top for eg . the user searches for the word key.the records are searched and the data is shown in order of the number of occurences 1.this is a key which is a test key and also the profile key (3 occurences) 2.key give me

问题 I am working on an Android application. In abstract, this application has an UI in order to interact with user and it also interacts with a remote service. The remote service adds a notification to Android launcher bar and this notification allows to redisplay the UI. The app and the service are in same package. The code of service notification function: private void showNotification (String contentText) { Intent intent = new Intent (this, my_app.class); intent.addFlags(Intent.FLAG_ACTIVITY

问题 The below class is a dynamic attribute generating directory walker by Anurag. import os class DirLister(object): def __init__(self, root): self.root = root self._list = None def __getattr__(self, name): try: var = super(DirLister).__getattr__(self, name) return var except AttributeError: return DirLister(os.path.join(self.root, name)) def __str__(self): self._load() return str(self._list) def _load(self): """ load once when needed """ if self._list is not None: return self._list = os.listdir