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用java做一个简单的投票系统,有三名表演者,代号,1.2.3。观众依次投票,已数字0结束,然后还

2023-07-23 09:20:42
共1条回复
余辉

import java.io.BufferedReader;

import java.io.InputStreamReader;

public class Vote {

public static void main(String args[]) {

try {

String[] persons = new String[]{"1","2","3"};

Integer[] votes = new Integer[]{0,0,0};

BufferedReader sin = new BufferedReader(new InputStreamReader(

System.in));

String readline;

System.out.println("================投票开始===============");

System.out.println("请按1,2,3投票,Enter确认");

System.out.println("按0-->Enter结束投票,公布结果 ");

readline = sin.readLine(); // 从系统标准输入读入一字符串

while (!readline.equals("0")) {

String voteStr = readline;

if(persons[0].equals(voteStr)){

votes[0] +=1;

}else if(persons[1].equals(voteStr)){

votes[1] +=1;

}else if(persons[2].equals(voteStr)){

votes[2] +=1;

}else{

System.out.println("无效的投票!");

}

readline = sin.readLine(); // 从系统标准输入读入一字符串

} // 继续循环

System.out.println("================投票结束===============");

System.out.println("================结果公布===============");

System.out.println(persons[0]+"================"+persons[1]+"==============="+persons[2]);

System.out.println(votes[0]+"================"+votes[1]+"==============="+votes[2]);

} catch (Exception e) {

System.out.println("Error" + e); // 出错,则打印出错信息

}

}

}

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2023-07-23 05:53:533

求一篇JAMES在NBA获得MVP的英文介绍?

JAMES NBA regular season MVP awardThe NBA regular season individual awards season, the highest honor - the most valuable player (MVP) yesterday go in the "Little Emperor" James name. In this way, the Cavaliers headed into NBA players in the history of the tenth player award in consecutive seasons. Earlier in the award selection, a total of nine players for two consecutive seasons was crowned the regular season MVP. They are superstars Russell, Wilt Chamberlain, Kareem Abdul-Jabbar, Malone, Bird, "Magic" Johnson, Michael Jordan, Tim Duncan and Steve Nash, of which Russell, Chamberlain and Bird superior, had three consecutive seasons of "value the highest. " The same day, James"s University in his hometown of Akron received the blessing of more than 3000 fans. Career when he won the second MVP trophy, the right high school teammates, coaches and his mother, thanked his girlfriend, and finally he invited, including O"Neill, Williams and other Cavaliers teammates came to power, and his share the joy of winning. "My name can be carved on this trophy," James said, "but they paid a lot of teammates." In this season"s regular season, James field team contributions are 29.7 points, 7.3 rebounds, 8.6 assists. In the James led the Cavaliers in the record, following last season ranked full league standings after the first, with 61 wins this season ranks all 21 league negative to the first. James made the selection in a landslide victory, winning total of 123 media workers from the United States and Canada and 116 in the hands of global fans first-place votes, total points over 1205 points. The poll is the second integral thunder team Durant (4 first-place votes), while the Lakers Kobe Bryant points came in third, but he did not get a first-place votes the judges. Orlando ranked fourth star Howard scored three first-place votes. MVP Award this season, a step towards innovation - the first time fans can be voted MVP. Web site by logging NBA fans, selected from five candidates for their own favorite MVP. However, the sum of all the fans to vote the final vote only in the official vote count a ballot paper. Not surprisingly, James has also gained fans to vote first 中文 来源:新华社
2023-07-23 05:54:121

They were the only men who received votes ______me.

选D,意思是他们是除我之外唯一得到选票的人。
2023-07-23 05:54:211

Had Paul received six more votes in the last election,he would have been our chairman now. 改错

很简单:Had Paul received six more votes in the last election,he would be our chairman now.后一个从句指现在,所以虚拟语气只能用would be,而不是用于过去时的would have been.保证答案正确,请及时采纳.祝学习...
2023-07-23 05:54:281

django项目 makemigrations时出现django.db.migrations.graph.nodenotfounderror错误。

1. 创建项目运行下面命令就可以创建一个 django 项目,项目名称叫 mysite :$ django-admin.py startproject mysite创建后的项目目录如下:mysite├── manage.py└── mysite ├── __init__.py ├── settings.py ├── urls.py └── wsgi.py1 directory, 5 files说明:__init__.py :让 Python 把该目录当成一个开发包 (即一组模块)所需的文件。 这是一个空文件,一般你不需要修改它。manage.py :一种命令行工具,允许你以多种方式与该 Django 项目进行交互。 键入python manage.py help,看一下它能做什么。 你应当不需要编辑这个文件;在这个目录下生成它纯是为了方便。settings.py :该 Django 项目的设置或配置。urls.py:Django项目的URL路由设置。目前,它是空的。wsgi.py:WSGI web 应用服务器的配置文件。更多细节,查看 How to deploy with WSGI接下来,你可以修改 settings.py 文件,例如:修改 LANGUAGE_CODE、设置时区 TIME_ZONESITE_ID = 1LANGUAGE_CODE = "zh_CN"TIME_ZONE = "Asia/Shanghai"USE_TZ = True 上面开启了 [Time zone]() 特性,需要安装 pytz:$ sudo pip install pytz2. 运行项目在运行项目之前,我们需要创建数据库和表结构,这里我使用的默认数据库:$ python manage.py migrateOperations to perform: Apply all migrations: admin, contenttypes, auth, sessionsRunning migrations: Applying contenttypes.0001_initial... OK Applying auth.0001_initial... OK Applying admin.0001_initial... OK Applying sessions.0001_initial... OK然后启动服务:$ python manage.py runserver你会看到下面的输出:Performing system checks...System check identified no issues (0 silenced).January 28, 2015 - 02:08:33Django version 1.7.1, using settings "mysite.settings"Starting development server at Quit the server with CONTROL-C.这将会在端口8000启动一个本地服务器, 并且只能从你的这台电脑连接和访问。 既然服务器已经运行起来了,现在用网页浏览器访问 。你应该可以看到一个令人赏心悦目的淡蓝色 Django 欢迎页面它开始工作了。你也可以指定启动端口:$ python manage.py runserver 8080以及指定 ip:$ python manage.py runserver 0.0.0.0:80003. 创建 app前面创建了一个项目并且成功运行,现在来创建一个 app,一个 app 相当于项目的一个子模块。在项目目录下创建一个 app:$ python manage.py startapp polls如果操作成功,你会在 mysite 文件夹下看到已经多了一个叫 polls 的文件夹,目录结构如下:polls├── __init__.py├── admin.py├── migrations│ └── __init__.py├── models.py├── tests.py└── views.py1 directory, 6 files4. 创建模型每一个 Django Model 都继承自 django.db.models.Model在 Model 当中每一个属性 attribute 都代表一个 database field通过 Django Model API 可以执行数据库的增删改查, 而不需要写一些数据库的查询语句打开 polls 文件夹下的 models.py 文件。创建两个模型:import datetimefrom django.db import modelsfrom django.utils import timezoneclass Question(models.Model): question_text = models.CharField(max_length=200) pub_date = models.DateTimeField("date published") def was_published_recently(self): return self.pub_date >= timezone.now() - datetime.timedelta(days=1)class Choice(models.Model): question = models.ForeignKey(Question) choice_text = models.CharField(max_length=200) votes = models.IntegerField(default=0)然后在 mysite/settings.py 中修改 INSTALLED_APPS 添加 polls:INSTALLED_APPS = ( "django.contrib.admin", "django.contrib.auth", "django.contrib.contenttypes", "django.contrib.sessions", "django.contrib.messages", "django.contrib.staticfiles", "polls",)在添加了新的 app 之后,我们需要运行下面命令告诉 Django 你的模型做了改变,需要迁移数据库:$ python manage.py makemigrations polls你会看到下面的输出日志:Migrations for "polls": 0001_initial.py: - Create model Choice - Create model Question - Add field question to choice你可以从 polls/migrations/0001_initial.py 查看迁移语句。运行下面语句,你可以查看迁移的 sql 语句:$ python manage.py sqlmigrate polls 0001输出结果:BEGIN;CREATE TABLE "polls_choice" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "choice_text" varchar(200) NOT NULL, "votes" integer NOT NULL);CREATE TABLE "polls_question" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "question_text" varchar(200) NOT NULL, "pub_date" datetime NOT NULL);CREATE TABLE "polls_choice__new" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "choice_text" varchar(200) NOT NULL, "votes" integer NOT NULL, "question_id" integer NOT NULL REFERENCES "polls_question" ("id"));INSERT INTO "polls_choice__new" ("choice_text", "votes", "id") SELECT "choice_text", "votes", "id" FROM "polls_choice";DROP TABLE "polls_choice";ALTER TABLE "polls_choice__new" RENAME TO "polls_choice";CREATE INDEX polls_choice_7aa0f6ee ON "polls_choice" ("question_id");COMMIT;你可以运行下面命令,来检查数据库是否有问题:$ python manage.py check再次运行下面的命令,来创建新添加的模型:$ python manage.py migrateOperations to perform: Apply all migrations: admin, contenttypes, polls, auth, sessionsRunning migrations: Applying polls.0001_initial... OK总结一下,当修改一个模型时,需要做以下几个步骤:修改 models.py 文件运行 python manage.py makemigrations 创建迁移语句运行 python manage.py migrate,将模型的改变迁移到数据库中你可以阅读 django-admin.py documentation,查看更多 manage.py 的用法。创建了模型之后,我们可以通过 Django 提供的 API 来做测试。运行下面命令可以进入到 python shell 的交互模式:$ python manage.py shell下面是一些测试:>>> from polls.models import Question, Choice # Import the model classes we just wrote.# No questions are in the system yet.>>> Question.objects.all()[]# Create a new Question.# Support for time zones is enabled in the default settings file, so# Django expects a datetime with tzinfo for pub_date. Use timezone.now()# instead of datetime.datetime.now() and it will do the right thing.>>> from django.utils import timezone>>> q = Question(question_text="What"s new?", pub_date=timezone.now())# Save the object into the database. You have to call save() explicitly.>>> q.save()# Now it has an ID. Note that this might say "1L" instead of "1", depending# on which database you"re using. That"s no biggie; it just means your# database backend prefers to return integers as Python long integer# objects.>>> q.id1# Access model field values via Python attributes.>>> q.question_text"What"s new?">>> q.pub_datedatetime.datetime(2012, 2, 26, 13, 0, 0, 775217, tzinfo=<UTC>)# Change values by changing the attributes, then calling save().>>> q.question_text = "What"s up?">>> q.save()# objects.all() displays all the questions in the database.>>> Question.objects.all()[<Question: Question object>]打印所有的 Question 时,输出的结果是 [<Question: Question object>],我们可以修改模型类,使其输出更为易懂的描述。修改模型类:from django.db import modelsclass Question(models.Model): # ... def __str__(self): # __unicode__ on Python 2 return self.question_textclass Choice(models.Model): # ... def __str__(self): # __unicode__ on Python 2 return self.choice_text接下来继续测试:>>> from polls.models import Question, Choice# Make sure our __str__() addition worked.>>> Question.objects.all()[<Question: What"s up?>]# Django provides a rich database lookup API that"s entirely driven by# keyword arguments.>>> Question.objects.filter(id=1)[<Question: What"s up?>]>>> Question.objects.filter(question_text__startswith="What")[<Question: What"s up?>]# Get the question that was published this year.>>> from django.utils import timezone>>> current_year = timezone.now().year>>> Question.objects.get(pub_date__year=current_year)<Question: What"s up?># Request an ID that doesn"t exist, this will raise an exception.>>> Question.objects.get(id=2)Traceback (most recent call last): ...DoesNotExist: Question matching query does not exist.# Lookup by a primary key is the most common case, so Django provides a# shortcut for primary-key exact lookups.# The following is identical to Question.objects.get(id=1).>>> Question.objects.get(pk=1)<Question: What"s up?># Make sure our custom method worked.>>> q = Question.objects.get(pk=1)# Give the Question a couple of Choices. The create call constructs a new# Choice object, does the INSERT statement, adds the choice to the set# of available choices and returns the new Choice object. Django creates# a set to hold the "other side" of a ForeignKey relation# (e.g. a question"s choice) which can be accessed via the API.>>> q = Question.objects.get(pk=1)# Display any choices from the related object set -- none so far.>>> q.choice_set.all()[]# Create three choices.>>> q.choice_set.create(choice_text="Not much", votes=0)<Choice: Not much>>>> q.choice_set.create(choice_text="The sky", votes=0)<Choice: The sky>>>> c = q.choice_set.create(choice_text="Just hacking again", votes=0)# Choice objects have API access to their related Question objects.>>> c.question<Question: What"s up?># And vice versa: Question objects get access to Choice objects.>>> q.choice_set.all()[<Choice: Not much>, <Choice: The sky>, <Choice: Just hacking again>]>>> q.choice_set.count()3# The API automatically follows relationships as far as you need.# Use double underscores to separate relationships.# This works as many levels deep as you want; there"s no limit.# Find all Choices for any question whose pub_date is in this year# (reusing the "current_year" variable we created above).>>> Choice.objects.filter(question__pub_date__year=current_year)[<Choice: Not much>, <Choice: The sky>, <Choice: Just hacking again>]# Let"s delete one of the choices. Use delete() for that.>>> c = q.choice_set.filter(choice_text__startswith="Just hacking")>>> c.delete()>>> 上面这部分测试,涉及到 django orm 相关的知识,详细说明可以参考 Django中的ORM。5. 管理 adminDjango有一个优秀的特性, 内置了Django admin后台管理界面, 方便管理者进行添加和删除网站的内容.新建的项目系统已经为我们设置好了后台管理功能,见 mysite/settings.py:INSTALLED_APPS = ( "django.contrib.admin", #默认添加后台管理功能 "django.contrib.auth", "django.contrib.contenttypes", "django.contrib.sessions", "django.contrib.messages", "django.contrib.staticfiles", "mysite",)同时也已经添加了进入后台管理的 url, 可以在 mysite/urls.py 中查看:url(r"^admin/", include(admin.site.urls)), #可以使用设置好的url进入网站后台接下来我们需要创建一个管理用户来登录 admin 后台管理界面:$ python manage.py createsuperuserUsername (leave blank to use "june"): adminEmail address:Password:Password (again):Superuser created successfully.总结最后,来看项目目录结构:mysite├── db.sqlite3├── manage.py├── mysite│ ├── __init__.py│ ├── settings.py│ ├── urls.py│ ├── wsgi.py├── polls│ ├── __init__.py│ ├── admin.py│ ├── migrations│ │ ├── 0001_initial.py│ │ ├── __init__.py│ ├── models.py│ ├── templates│ │ └── polls│ │ ├── detail.html│ │ ├── index.html│ │ └── results.html│ ├── tests.py│ ├── urls.py│ ├── views.py└── templates └── admin └── base_site.htm 通过上面的介绍,对 django 的安装、运行以及如何创建视 图和模型有了一个清晰的认识,接下来就可以深入的学习 django 的自动化测试、持久化、中间件、国 际 化等知识。
2023-07-23 05:54:371

求英语语法高手解惑,..题目如下

同意上面对28,29,34的回答。其它有不同看法:30题答案应该为B.otherwise,otherwise是副词,意为“否则的话”,全句意为:他应该是在工作,否则的话是在忙着。如果用else一般跟or的后面,而but的后面常跟otherwise31.全面有having received...,表明此动作在前,故后面不用to have been33.整个句子都是逗号,所以答案应该是which,其它答案均错,从语法上是不成立的。
2023-07-23 05:54:472

IMDB到底是如何评分和排名的?

我这几年下来已经投了快550本电影的票了,不知道算不算regular voters,估计他们看到注册地是中国大陆的就直接无视了
2023-07-23 05:54:552

有一部电影是杨千华和梁朝伟演的,梁朝伟扮演一个算命的人,叫赖料布,请问这部电影叫什么名字

me too
2023-07-23 05:55:055

请问什么是IMDB评分?

IMDB是目前全球互联网中最大的一个电影资料库,里面包括了几乎所有的电影,以及1982年以后的电视剧集。IMDB的资料中包括了影片的众多信息,演员,片长,内容介绍,分级,评论等,就个人买碟而言,很大程度上也是参考IMDB的得分。 而IMDB的得分又是如何来的呢?它的可靠性又有多少呢?让我们通过《魔戒1:护戒使者》来做具体分析吧,先看上图: 这张图就是魔戒1的所有评分者的分数的一个条状统计图。 从中我们可以看到各个分数段的大致比例,比如这儿就可以发现,超过一半的人是打满分的。 根据IMDB网站上公布的TOP250评分标准: imdb top 250用的是贝叶斯统计的算法得出的加权分(Weighted Rank-WR),公式如下: weighted rank (WR) = (v ÷ (v+m)) × R + (m ÷ (v+m)) × C 其中: R = average for the movie (mean) = (Rating) (是用普通的方法计算出的平均分) v = number of votes for the movie = (votes)(投票人数,需要注意的是,只有经常投票者才会被计算在内,这个下面详细解释) m = minimum votes required to be listed in the top 250 (currently 1250) (进入imdb top 250需要的最小票数,只有三两个人投票的电影就算得满分也没用的) C = the mean vote across the whole report (currently 6.9) (目前所有电影的平均得分) 另外重点来了,根据这个注释: note: for this top 250, only votes from regular voters are considered. 只有‘regular voters‘的投票才会被计算在IMDB top 250之内,这就是IMDB防御因为某种电影的fans拉票而影响 top 250结果,把top 250尽量限制在资深影迷投票范围内的主要方法。regular voter的标准不详,估计至少是“投票电影超过xxx 部以上”这样的水平,搞不好还会加上投票的时间分布,为支持自己的心爱电影一天内给N百部电影投票估计也不行。 因此,细心的人可以注意到,列入IMDB top 250的电影,其主页面上的分数与250列表中的分数是不同的。以魔戒1为例,它在自己的页面http://www.imdb.com/title/tt0120737/中的分数是8.8,而列表中是8.7。一般 250表中的得分都会低于自己页面中的得分,越是娱乐片差距越大。这大概是因为regular voter对于电影的要求通常较高的关系。
2023-07-23 05:55:331

share怎么读

山若
2023-07-23 05:55:425

If paul had received six more votes in the last election,he?

A 首先在A和B两个选项中选,因为题目已经确定是虚拟句所以肯定是过去时态,而从句是过去完成时态,主句是表示的"现在",所以就是过去时态了.(根据虚拟句的法则,是过去的事情那么从句就用过去的过去即过去完成时态)而B选项的意思是"本该```"的意思,如:you should have finished your homework before supper.你本该在晚饭前完成作业.,2,a 条件句过去时虚拟语气 主句现代时虚拟语气 结构:would + do,2,A 很简单,用不着一堆语法解释。条件句是对过去的假设,主句是对现在的假设,都是虚拟的,就都按照正常时态倒退一个时态就好了。,2,D,2,答案 是 B 因为是对过去条件的 假设 是虚拟语气句型,2,B,2,选择B,过去将来时,俺是凭语感得出答案的,不用说了,你问问老外,肯定是B 如果paul在上次的投票中得到多于6票的选票,那他现在就应该是我们的主席了 这样看看,选什么?,1,A 这是个混合虚拟语气,从句是对过去的虚拟所以用的是had received,而主句是对现在情况的虚拟(用了时间状语now),所以用的是would be。,0,If paul had received six more votes in the last election,he ______ our chairman now. A.would be B.would have been C.will be D.must have been. 请说出选择的理由. 可是我的语感告诉我是B。 我很难理解A的感觉!
2023-07-23 05:56:041

急求c语言 dev c++) 利用结构体做一个小系统,为什么直接无法编译运行?

调用mistake函数,不需要加上void
2023-07-23 05:56:212

Lo-Pro的《Fuel》 歌词

歌曲名:Fuel歌手:Lo-Pro专辑:Lo-ProArtist - CatatoniaAlbum - Paper Scissors StoneLyrics - Fuel我爱摇滚和唐慧QQ;1015762832Go tell the captainThere"s no waters leftTo navigateI sailed them all for you...Go tell the engine roomStop stoking up the fireWe"re out of fuel...Doom looms large on my horizonMountain toxic, river poisonFools get votes in a democracy...We"ll build new ring roadsTo go nowhere in particularNow you"ve passed your Highway CodeAnd make new inroadsInto plundering the EarthFor some more fuel...Doom looms large on my horizonMountain toxic, river poisonFools get votes in a democracy...Go ask the GovernmentYou voted in on trustWhere is our fuel?...Doom looms large on my horizonMountain toxic, river poisonFools get votes in a democracy...Doom looms large on my horizonMountain toxic, river poisonFools get votes in a democracy...http://music.baidu.com/song/8045620
2023-07-23 05:56:391

几道英语选折题 帮帮忙

A B D B A A C B应该是这样的吧!^-^
2023-07-23 05:56:493

如何创建一个Django网站

本文演示如何创建一个简单的 django 网站,使用的 django 版本为1.7。1. 创建项目运行下面命令就可以创建一个 django 项目,项目名称叫 mysite :$ django-admin.py startproject mysite创建后的项目目录如下:mysite├── manage.py└── mysite ├── __init__.py ├── settings.py ├── urls.py └── wsgi.py1 directory, 5 files说明:__init__.py :让 Python 把该目录当成一个开发包 (即一组模块)所需的文件。 这是一个空文件,一般你不需要修改它。manage.py :一种命令行工具,允许你以多种方式与该 Django 项目进行交互。 键入python manage.py help,看一下它能做什么。 你应当不需要编辑这个文件;在这个目录下生成它纯是为了方便。settings.py :该 Django 项目的设置或配置。urls.py:Django项目的URL路由设置。目前,它是空的。wsgi.py:WSGI web 应用服务器的配置文件。更多细节,查看 How to deploy with WSGI接下来,你可以修改 settings.py 文件,例如:修改 LANGUAGE_CODE、设置时区 TIME_ZONESITE_ID = 1LANGUAGE_CODE = "zh_CN"TIME_ZONE = "Asia/Shanghai"USE_TZ = True 上面开启了 [Time zone](https://docs.djangoproject.com/en/1.7/topics/i18n/timezones/) 特性,需要安装 pytz:$ sudo pip install pytz2. 运行项目在运行项目之前,我们需要创建数据库和表结构,这里我使用的默认数据库:$ python manage.py migrateOperations to perform: Apply all migrations: admin, contenttypes, auth, sessionsRunning migrations: Applying contenttypes.0001_initial... OK Applying auth.0001_initial... OK Applying admin.0001_initial... OK Applying sessions.0001_initial... OK然后启动服务:$ python manage.py runserver你会看到下面的输出:Performing system checks...System check identified no issues (0 silenced).January 28, 2015 - 02:08:33Django version 1.7.1, using settings "mysite.settings"Starting development server at http://127.0.0.1:8000/Quit the server with CONTROL-C.这将会在端口8000启动一个本地服务器, 并且只能从你的这台电脑连接和访问。 既然服务器已经运行起来了,现在用网页浏览器访问 http://127.0.0.1:8000/。你应该可以看到一个令人赏心悦目的淡蓝色 Django 欢迎页面它开始工作了。你也可以指定启动端口:$ python manage.py runserver 8080以及指定 ip:$ python manage.py runserver 0.0.0.0:80003. 创建 app前面创建了一个项目并且成功运行,现在来创建一个 app,一个 app 相当于项目的一个子模块。在项目目录下创建一个 app:$ python manage.py startapp polls如果操作成功,你会在 mysite 文件夹下看到已经多了一个叫 polls 的文件夹,目录结构如下:polls├── __init__.py├── admin.py├── migrations│ └── __init__.py├── models.py├── tests.py└── views.py1 directory, 6 files4. 创建模型每一个 Django Model 都继承自 django.db.models.Model在 Model 当中每一个属性 attribute 都代表一个 database field通过 Django Model API 可以执行数据库的增删改查, 而不需要写一些数据库的查询语句打开 polls 文件夹下的 models.py 文件。创建两个模型:import datetimefrom django.db import modelsfrom django.utils import timezoneclass Question(models.Model): question_text = models.CharField(max_length=200) pub_date = models.DateTimeField("date published") def was_published_recently(self): return self.pub_date >= timezone.now() - datetime.timedelta(days=1)class Choice(models.Model): question = models.ForeignKey(Question) choice_text = models.CharField(max_length=200) votes = models.IntegerField(default=0)然后在 mysite/settings.py 中修改 INSTALLED_APPS 添加 polls:INSTALLED_APPS = ( "django.contrib.admin", "django.contrib.auth", "django.contrib.contenttypes", "django.contrib.sessions", "django.contrib.messages", "django.contrib.staticfiles", "polls",)在添加了新的 app 之后,我们需要运行下面命令告诉 Django 你的模型做了改变,需要迁移数据库:$ python manage.py makemigrations polls你会看到下面的输出日志:Migrations for "polls": 0001_initial.py: - Create model Choice - Create model Question - Add field question to choice你可以从 polls/migrations/0001_initial.py 查看迁移语句。运行下面语句,你可以查看迁移的 sql 语句:$ python manage.py sqlmigrate polls 0001输出结果:BEGIN;CREATE TABLE "polls_choice" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "choice_text" varchar(200) NOT NULL, "votes" integer NOT NULL);CREATE TABLE "polls_question" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "question_text" varchar(200) NOT NULL, "pub_date" datetime NOT NULL);CREATE TABLE "polls_choice__new" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "choice_text" varchar(200) NOT NULL, "votes" integer NOT NULL, "question_id" integer NOT NULL REFERENCES "polls_question" ("id"));INSERT INTO "polls_choice__new" ("choice_text", "votes", "id") SELECT "choice_text", "votes", "id" FROM "polls_choice";DROP TABLE "polls_choice";ALTER TABLE "polls_choice__new" RENAME TO "polls_choice";CREATE INDEX polls_choice_7aa0f6ee ON "polls_choice" ("question_id");COMMIT;你可以运行下面命令,来检查数据库是否有问题:$ python manage.py check再次运行下面的命令,来创建新添加的模型:$ python manage.py migrateOperations to perform: Apply all migrations: admin, contenttypes, polls, auth, sessionsRunning migrations: Applying polls.0001_initial... OK总结一下,当修改一个模型时,需要做以下几个步骤:修改 models.py 文件运行 python manage.py makemigrations 创建迁移语句运行 python manage.py migrate,将模型的改变迁移到数据库中你可以阅读 django-admin.py documentation,查看更多 manage.py 的用法。创建了模型之后,我们可以通过 Django 提供的 API 来做测试。运行下面命令可以进入到 python shell 的交互模式:$ python manage.py shell下面是一些测试:>>> from polls.models import Question, Choice # Import the model classes we just wrote.# No questions are in the system yet.>>> Question.objects.all()[]# Create a new Question.# Support for time zones is enabled in the default settings file, so# Django expects a datetime with tzinfo for pub_date. Use timezone.now()# instead of datetime.datetime.now() and it will do the right thing.>>> from django.utils import timezone>>> q = Question(question_text="What"s new?", pub_date=timezone.now())# Save the object into the database. You have to call save() explicitly.>>> q.save()# Now it has an ID. Note that this might say "1L" instead of "1", depending# on which database you"re using. That"s no biggie; it just means your# database backend prefers to return integers as Python long integer# objects.>>> q.id1# Access model field values via Python attributes.>>> q.question_text"What"s new?">>> q.pub_datedatetime.datetime(2012, 2, 26, 13, 0, 0, 775217, tzinfo=<UTC>)# Change values by changing the attributes, then calling save().>>> q.question_text = "What"s up?">>> q.save()# objects.all() displays all the questions in the database.>>> Question.objects.all()[<Question: Question object>]打印所有的 Question 时,输出的结果是 [<Question: Question object>],我们可以修改模型类,使其输出更为易懂的描述。修改模型类:from django.db import modelsclass Question(models.Model): # ... def __str__(self): # __unicode__ on Python 2 return self.question_textclass Choice(models.Model): # ... def __str__(self): # __unicode__ on Python 2 return self.choice_text接下来继续测试:>>> from polls.models import Question, Choice# Make sure our __str__() addition worked.>>> Question.objects.all()[<Question: What"s up?>]# Django provides a rich database lookup API that"s entirely driven by# keyword arguments.>>> Question.objects.filter(id=1)[<Question: What"s up?>]>>> Question.objects.filter(question_text__startswith="What")[<Question: What"s up?>]# Get the question that was published this year.>>> from django.utils import timezone>>> current_year = timezone.now().year>>> Question.objects.get(pub_date__year=current_year)<Question: What"s up?># Request an ID that doesn"t exist, this will raise an exception.>>> Question.objects.get(id=2)Traceback (most recent call last): ...DoesNotExist: Question matching query does not exist.# Lookup by a primary key is the most common case, so Django provides a# shortcut for primary-key exact lookups.# The following is identical to Question.objects.get(id=1).>>> Question.objects.get(pk=1)<Question: What"s up?># Make sure our custom method worked.>>> q = Question.objects.get(pk=1)# Give the Question a couple of Choices. The create call constructs a new# Choice object, does the INSERT statement, adds the choice to the set# of available choices and returns the new Choice object. Django creates# a set to hold the "other side" of a ForeignKey relation# (e.g. a question"s choice) which can be accessed via the API.>>> q = Question.objects.get(pk=1)# Display any choices from the related object set -- none so far.>>> q.choice_set.all()[]# Create three choices.>>> q.choice_set.create(choice_text="Not much", votes=0)<Choice: Not much>>>> q.choice_set.create(choice_text="The sky", votes=0)<Choice: The sky>>>> c = q.choice_set.create(choice_text="Just hacking again", votes=0)# Choice objects have API access to their related Question objects.>>> c.question<Question: What"s up?># And vice versa: Question objects get access to Choice objects.>>> q.choice_set.all()[<Choice: Not much>, <Choice: The sky>, <Choice: Just hacking again>]>>> q.choice_set.count()3# The API automatically follows relationships as far as you need.# Use double underscores to separate relationships.# This works as many levels deep as you want; there"s no limit.# Find all Choices for any question whose pub_date is in this year# (reusing the "current_year" variable we created above).>>> Choice.objects.filter(question__pub_date__year=current_year)[<Choice: Not much>, <Choice: The sky>, <Choice: Just hacking again>]# Let"s delete one of the choices. Use delete() for that.>>> c = q.choice_set.filter(choice_text__startswith="Just hacking")>>> c.delete()>>> 上面这部分测试,涉及到 django orm 相关的知识,详细说明可以参考 Django中的ORM。5. 管理 adminDjango有一个优秀的特性, 内置了Django admin后台管理界面, 方便管理者进行添加和删除网站的内容.新建的项目系统已经为我们设置好了后台管理功能,见 mysite/settings.py:INSTALLED_APPS = ( "django.contrib.admin", #默认添加后台管理功能 "django.contrib.auth", "django.contrib.contenttypes", "django.contrib.sessions", "django.contrib.messages", "django.contrib.staticfiles", "mysite",)同时也已经添加了进入后台管理的 url, 可以在 mysite/urls.py 中查看:url(r"^admin/", include(admin.site.urls)), #可以使用设置好的url进入网站后台接下来我们需要创建一个管理用户来登录 admin 后台管理界面:$ python manage.py createsuperuserUsername (leave blank to use "june"): adminEmail address:Password:Password (again):Superuser created successfully.总结最后,来看项目目录结构:mysite├── db.sqlite3├── manage.py├── mysite│ ├── __init__.py│ ├── settings.py│ ├── urls.py│ ├── wsgi.py├── polls│ ├── __init__.py│ ├── admin.py│ ├── migrations│ │ ├── 0001_initial.py│ │ ├── __init__.py│ ├── models.py│ ├── templates│ │ └── polls│ │ ├── detail.html│ │ ├── index.html│ │ └── results.html│ ├── tests.py│ ├── urls.py│ ├── views.py└── templates └── admin └── base_site.htm 通过上面的介绍,对 django 的安装、运行以及如何创建视 图和模型有了一个清晰的认识,接下来就可以深入的学习 django 的自动化测试、持久化、中间件、国 际 化等知识。
2023-07-23 05:56:581

如何解决Django 1.8在migrate时失败

1. 创建项目运行下面命令就可以创建一个 django 项目,项目名称叫 mysite :$ django-admin.py startproject mysite创建后的项目目录如下:mysite├── manage.py└── mysite├── __init__.py├── settings.py├── urls.py└── wsgi.py1 directory, 5 files说明:__init__.py :让 Python 把该目录当成一个开发包 (即一组模块)所需的文件。 这是一个空文件,一般你不需要修改它。manage.py :一种命令行工具,允许你以多种方式与该 Django 项目进行交互。 键入python manage.py help,看一下它能做什么。 你应当不需要编辑这个文件;在这个目录下生成它纯是为了方便。settings.py :该 Django 项目的设置或配置。urls.py:Django项目的URL路由设置。目前,它是空的。wsgi.py:WSGI web 应用服务器的配置文件。更多细节,查看 How to deploy with WSGI接下来,你可以修改 settings.py 文件,例如:修改 LANGUAGE_CODE、设置时区 TIME_ZONESITE_ID = 1LANGUAGE_CODE = "zh_CN"TIME_ZONE = "Asia/Shanghai"USE_TZ = True 上面开启了 [Time zone](https://docs.djangoproject.com/en/1.7/topics/i18n/timezones/) 特性,需要安装 pytz:$ sudo pip install pytz2. 运行项目在运行项目之前,我们需要创建数据库和表结构,这里我使用的默认数据库:$ python manage.py migrateOperations to perform:Apply all migrations: admin, contenttypes, auth, sessionsRunning migrations:Applying contenttypes.0001_initial... OKApplying auth.0001_initial... OKApplying admin.0001_initial... OKApplying sessions.0001_initial... OK然后启动服务:$ python manage.py runserver你会看到下面的输出:Performing system checks...System check identified no issues (0 silenced).January 28, 2015 - 02:08:33Django version 1.7.1, using settings "mysite.settings"Starting development server at http://127.0.0.1:8000/Quit the server with CONTROL-C.这将会在端口8000启动一个本地服务器, 并且只能从你的这台电脑连接和访问。 既然服务器已经运行起来了,现在用网页浏览器访问 http://127.0.0.1:8000/。你应该可以看到一个令人赏心悦目的淡蓝色 Django 欢迎页面它开始工作了。你也可以指定启动端口:$ python manage.py runserver 8080以及指定 ip:$ python manage.py runserver 0.0.0.0:80003. 创建 app前面创建了一个项目并且成功运行,现在来创建一个 app,一个 app 相当于项目的一个子模块。在项目目录下创建一个 app:$ python manage.py startapp polls如果操作成功,你会在 mysite 文件夹下看到已经多了一个叫 polls 的文件夹,目录结构如下:polls├── __init__.py├── admin.py├── migrations│ └── __init__.py├── models.py├── tests.py└── views.py1 directory, 6 files4. 创建模型每一个 Django Model 都继承自 django.db.models.Model在 Model 当中每一个属性 attribute 都代表一个 database field通过 Django Model API 可以执行数据库的增删改查, 而不需要写一些数据库的查询语句打开 polls 文件夹下的 models.py 文件。创建两个模型:import datetimefrom django.db import modelsfrom django.utils import timezoneclass Question(models.Model):question_text = models.CharField(max_length=200)pub_date = models.DateTimeField("date published")def was_published_recently(self):return self.pub_date >= timezone.now() - datetime.timedelta(days=1)class Choice(models.Model):question = models.ForeignKey(Question)choice_text = models.CharField(max_length=200)votes = models.IntegerField(default=0)然后在 mysite/settings.py 中修改 INSTALLED_APPS 添加 polls:INSTALLED_APPS = ("django.contrib.admin","django.contrib.auth","django.contrib.contenttypes","django.contrib.sessions","django.contrib.messages","django.contrib.staticfiles","polls",)在添加了新的 app 之后,我们需要运行下面命令告诉 Django 你的模型做了改变,需要迁移数据库:$ python manage.py makemigrations polls你会看到下面的输出日志:Migrations for "polls":0001_initial.py:- Create model Choice- Create model Question- Add field question to choice你可以从 polls/migrations/0001_initial.py 查看迁移语句。运行下面语句,你可以查看迁移的 sql 语句:$ python manage.py sqlmigrate polls 0001输出结果:BEGIN;CREATE TABLE "polls_choice" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "choice_text" varchar(200) NOT NULL, "votes" integer NOT NULL);CREATE TABLE "polls_question" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "question_text" varchar(200) NOT NULL, "pub_date" datetime NOT NULL);CREATE TABLE "polls_choice__new" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "choice_text" varchar(200) NOT NULL, "votes" integer NOT NULL, "question_id" integer NOT NULL REFERENCES "polls_question" ("id"));INSERT INTO "polls_choice__new" ("choice_text", "votes", "id") SELECT "choice_text", "votes", "id" FROM "polls_choice";DROP TABLE "polls_choice";ALTER TABLE "polls_choice__new" RENAME TO "polls_choice";CREATE INDEX polls_choice_7aa0f6ee ON "polls_choice" ("question_id");COMMIT;你可以运行下面命令,来检查数据库是否有问题:$ python manage.py check再次运行下面的命令,来创建新添加的模型:$ python manage.py migrateOperations to perform:Apply all migrations: admin, contenttypes, polls, auth, sessionsRunning migrations:Applying polls.0001_initial... OK总结一下,当修改一个模型时,需要做以下几个步骤:修改 models.py 文件运行 python manage.py makemigrations 创建迁移语句运行 python manage.py migrate,将模型的改变迁移到数据库中你可以阅读 django-admin.py documentation,查看更多 manage.py 的用法。创建了模型之后,我们可以通过 Django 提供的 API 来做测试。运行下面命令可以进入到 python shell 的交互模式:$ python manage.py shell下面是一些测试:>>> from polls.models import Question, Choice # Import the model classes we just wrote.# No questions are in the system yet.>>> Question.objects.all()[]# Create a new Question.# Support for time zones is enabled in the default settings file, so# Django expects a datetime with tzinfo for pub_date. Use timezone.now()# instead of datetime.datetime.now() and it will do the right thing.>>> from django.utils import timezone>>> q = Question(question_text="What"s new?", pub_date=timezone.now())# Save the object into the database. You have to call save() explicitly.>>> q.save()# Now it has an ID. Note that this might say "1L" instead of "1", depending# on which database you"re using. That"s no biggie; it just means your# database backend prefers to return integers as Python long integer# objects.>>> q.id1# Access model field values via Python attributes.>>> q.question_text"What"s new?">>> q.pub_datedatetime.datetime(2012, 2, 26, 13, 0, 0, 775217, tzinfo=<UTC>)# Change values by changing the attributes, then calling save().>>> q.question_text = "What"s up?">>> q.save()# objects.all() displays all the questions in the database.>>> Question.objects.all()[<Question: Question object>]打印所有的 Question 时,输出的结果是 [<Question: Question object>],我们可以修改模型类,使其输出更为易懂的描述。修改模型类:from django.db import modelsclass Question(models.Model):# ...def __str__(self): # __unicode__ on Python 2return self.question_textclass Choice(models.Model):# ...def __str__(self): # __unicode__ on Python 2return self.choice_text接下来继续测试:>>> from polls.models import Question, Choice# Make sure our __str__() addition worked.>>> Question.objects.all()[<Question: What"s up?>]# Django provides a rich database lookup API that"s entirely driven by# keyword arguments.>>> Question.objects.filter(id=1)[<Question: What"s up?>]>>> Question.objects.filter(question_text__startswith="What")[<Question: What"s up?>]# Get the question that was published this year.>>> from django.utils import timezone>>> current_year = timezone.now().year>>> Question.objects.get(pub_date__year=current_year)<Question: What"s up?># Request an ID that doesn"t exist, this will raise an exception.>>> Question.objects.get(id=2)Traceback (most recent call last):...DoesNotExist: Question matching query does not exist.# Lookup by a primary key is the most common case, so Django provides a# shortcut for primary-key exact lookups.# The following is identical to Question.objects.get(id=1).>>> Question.objects.get(pk=1)<Question: What"s up?># Make sure our custom method worked.>>> q = Question.objects.get(pk=1)# Give the Question a couple of Choices. The create call constructs a new# Choice object, does the INSERT statement, adds the choice to the set# of available choices and returns the new Choice object. Django creates# a set to hold the "other side" of a ForeignKey relation# (e.g. a question"s choice) which can be accessed via the API.>>> q = Question.objects.get(pk=1)# Display any choices from the related object set -- none so far.>>> q.choice_set.all()[]# Create three choices.>>> q.choice_set.create(choice_text="Not much", votes=0)<Choice: Not much>>>> q.choice_set.create(choice_text="The sky", votes=0)<Choice: The sky>>>> c = q.choice_set.create(choice_text="Just hacking again", votes=0)# Choice objects have API access to their related Question objects.>>> c.question<Question: What"s up?># And vice versa: Question objects get access to Choice objects.>>> q.choice_set.all()[<Choice: Not much>, <Choice: The sky>, <Choice: Just hacking again>]>>> q.choice_set.count()3# The API automatically follows relationships as far as you need.# Use double underscores to separate relationships.# This works as many levels deep as you want; there"s no limit.# Find all Choices for any question whose pub_date is in this year# (reusing the "current_year" variable we created above).>>> Choice.objects.filter(question__pub_date__year=current_year)[<Choice: Not much>, <Choice: The sky>, <Choice: Just hacking again>]# Let"s delete one of the choices. Use delete() for that.>>> c = q.choice_set.filter(choice_text__startswith="Just hacking")>>> c.delete()>>> 上面这部分测试,涉及到 django orm 相关的知识,详细说明可以参考 Django中的ORM。5. 管理 adminDjango有一个优秀的特性, 内置了Django admin后台管理界面, 方便管理者进行添加和删除网站的内容.新建的项目系统已经为我们设置好了后台管理功能,见 mysite/settings.py:INSTALLED_APPS = ("django.contrib.admin", #默认添加后台管理功能"django.contrib.auth","django.contrib.contenttypes","django.contrib.sessions","django.contrib.messages","django.contrib.staticfiles","mysite",)同时也已经添加了进入后台管理的 url, 可以在 mysite/urls.py 中查看:url(r"^admin/", include(admin.site.urls)), #可以使用设置好的url进入网站后台接下来我们需要创建一个管理用户来登录 admin 后台管理界面:$ python manage.py createsuperuserUsername (leave blank to use "june"): adminEmail address:Password:Password (again):Superuser created successfully.总结最后,来看项目目录结构:mysite├── db.sqlite3├── manage.py├── mysite│ ├── __init__.py│ ├── settings.py│ ├── urls.py│ ├── wsgi.py├── polls│ ├── __init__.py│ ├── admin.py│ ├── migrations│ │ ├── 0001_initial.py│ │ ├── __init__.py│ ├── models.py│ ├── templates│ │ └── polls│ │ ├── detail.html│ │ ├── index.html│ │ └── results.html│ ├── tests.py│ ├── urls.py│ ├── views.py└── templates└── admin└── base_site.htm
2023-07-23 05:57:061

大连海事大学研究生复试是线上还是线下

大连海事大学研究生复试是线上。根据查询相关公开信息显示:由于疫情原因,大连海事大学2022年研究生复试工作在线上进行。研究生复试是研究生考试制度的重要组成部分,即通过研究生入学考试(初试)后参加的,由报考院校组织进行的第二次考试,分笔试和面试。
2023-07-23 05:47:131

what do i believe? what laws do i live by? there

你好!很高兴为你解答。我相信什么?_?我活着的法则是什么 ?有太多太多的答案了。希望能帮到你。
2023-07-23 05:47:182

in the path of什么意思?

在去。。。地方的路上
2023-07-23 05:47:193

Happy Together 歌词

Imagine me & U,I do.想象着我与你共聚,我想象着。I think about U day & night.我不分昼夜的想着你。 It"s only right.这是我该做的。 To think about the girl U love.想着你心爱的女孩 And hold her tight.并把她抱紧。 So happy together.让我们皆大欢喜。 If I should call U up,invest a dime 我是否该投进一枚硬币以便给你去电话? And U say U belong 2 me.(在电话里)你说你属于我。 And ease my mind.这使我安逸。 Imagine how the world could be.试想那样的话世界将变得- So very fine.多么美好。So happy together.让我们皆大欢喜。I can see me lovin" nobody but U.我无法想象除了你我还会爱上别人。 For all my life.伴我一生。 When U"re with me baby the skies"ll be blue.只有当你与我共聚时天才会蓝。 For all my life.在我的一生中。 Me & U,and U & me.我与你,你与我。 No matter how they toss the dice.无论他们怎样猜测(无论他们抛出什么花色)。 It had 2 be.我们都会在一起。 The only one 4 me is U.你是我的唯一。 And U 4 me.你只属于我。 So happy together.让我们皆大欢喜。Ba-Ba-Ba-Ba Ba-Ba-Ba-Ba Ba-Ba-Ba-Ba Ba-Ba-Ba-Ba.So happy together ! 所以让我们欢欢喜喜在一起吧!How is the weather(Ba-Ba-Ba-Ba Ba-Ba-Ba-Ba).无论天气如何变换。 So happy together(Ba-Ba-Ba-Ba Ba-Ba-Ba-Ba)! 欢欢喜喜在一起吧! We"re happy together(Ba-Ba-Ba-Ba Ba-Ba-Ba-Ba)! 我们欢欢喜喜在一起!
2023-07-23 05:47:191

by law还是by laws

Article of Incorporation和By-laws,两者都是指公司章程。一般,Article of Incorporation 是指公司的设立章程,主要内容包括设立公司的名称、地址、经营范围、股东以及股份等公司设立时确定的基本事项。而By-Laws 是指内部管理章程,主要包括公司的组织架构,股东会、董事会、监事会的职权等公司内部管理事项。
2023-07-23 05:47:111

甲硝唑的副作用

据说甲硝唑影响智力!McGraw博士还对文献中的63例甲硝唑脑病病例报告进行了综述,发现44例(70%)磁共振成像显示小脑齿状核T2高信号,与本例患者一致。还有19例(30%)为胼胝体压部T2高信号。这些都是“中毒性脑病的典型表现”。构音障碍、步态共济失调、心理状态问题、手臂协调问题、腿部力量问题和癫痫也较常见,众所周知,甲硝唑可引起外周神经病变,但鲜为人知的是它也可引起类似脱髓鞘疾病的中毒性脑病
2023-07-23 05:47:095

什么是动漫

动漫是一种新颖生动的视觉艺术形式,它是由“动画”和“漫画”两个单词合并而成的。将两者完美地结合在一起,创造出让人们耳目一新的感官享受。动漫的魅力在于它能够通过生动的图像和情节,表达出青年人的喜好和情感,同时在现实世界中却很难得到释放。它给年轻人们带来了一个高度自由的创造空间,让他们在虚拟的世界中尽情表达自我,交流思想,树立自信。动漫也成为了世界文化的一部分,它能够让人们了解到不同的文化背景和价值观念,从而帮助人们更好地了解和理解不同的文化,增进相互理解和文化交流。总之,动漫是一种独具匠心的艺术形式,它给人们带来了无穷的欢乐和思考,它不仅仅是一个简单的娱乐媒介,更成为了人们生活中不可或缺的一部分。
2023-07-23 05:47:092

有大连海事大学的学长在读社会工作研的对学弟有帮助吗

有帮助。学长是指大一级或两级的学生,而有大连海事大学的学长在读社会工作研究生,有很多自己的经验是对学弟很有帮助的。大连海事大学(原大连海运学院)是交通运输部所属的全国重点大学,是国家“211工程”重点建设高校、国家“双一流”建设高校。
2023-07-23 05:47:061