我在安装了Node.js的Amazon EC2上运行Debian实例.如果我运行以下代码:
http = require('http');
http.createServer(function (request, response){
response.writeHead(200, {'Content-Type':'text/plain'});
response.end('Hello World\n');
}).listen(80);
console.log("Running server at port 80");
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我得到下面的输出告诉我有另一个进程在端口80监听:
Running server at port 80
events.js:72
throw er; // Unhandled 'error' event
^
Error: listen EACCES
at errnoException (net.js:901:11)
at Server._listen2 (net.js:1020:19)
at listen (net.js:1061:10)
at Server.listen (net.js:1127:5)
at Object.<anonymous> (/home/admin/nodetests/nodetest.js:6:4)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
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现在,当我检查是否有一个进程(以root用户隐藏)时,使用以下方法监听端口80:
netstat -tupln
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我得到以下输出,它告诉我没有在端口80收听:
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign …
Run Code Online (Sandbox Code Playgroud) 如何使用curl将收到的cookie信息打印到stdout?
根据手册页,如果你使用' - '作为-c --cookie-jar选项的文件名,它应该将cookie打印到stdout.问题是我收到一个错误:
curl: option -: is unknown
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我正在运行的命令的示例:
curl -c --cookie-jar - 'http://google.com'
Run Code Online (Sandbox Code Playgroud) 我是使用sqlalchemy的新手.如何摆脱下面显示的表的循环依赖性错误.基本上我的目标是创建一个问题表,其中一对一关系"最佳答案"可以回答,一对多关系也可以"possible_answers".
class Answer(Base):
__tablename__ = 'answers'
id = Column(Integer, primary_key=True)
text = Column(String)
question_id = Column(Integer, ForeignKey('questions.id'))
def __init__(self, text, question_id):
self.text = text
def __repr__(self):
return "<Answer '%s'>" % self.text
class Question(Base):
__tablename__ = 'questions'
id = Column(Integer, primary_key=True)
text = Column(String)
picture = Column(String)
depth = Column(Integer)
amount_of_tasks = Column(Integer)
voting_threshold = Column(Integer)
best_answer_id = Column(Integer, ForeignKey('answers.id'), nullable=True)
possible_answers = relationship("Answer", post_update=True, primaryjoin = id==Answer.question_id)
def __init__(self, text, picture, depth, amount_of_tasks):
self.text = text
self.picture = picture
self.depth …
Run Code Online (Sandbox Code Playgroud) 我正在尝试将直接从 pymongo 获取的 bson 数据转换为 json 数据。有没有一种直接的方法可以使用 pymongo 或其他东西用 python 来做到这一点?
如果有帮助,这是代码:
def email_main(request):
collection = get_collection("nimbus").fullcontact_email_data
if request.method == "POST":
data = collection.save(dict(request.POST.iterlists()))
response = HttpResponse(data, content_type="application/json")
elif request.method == "GET":
getParams = convertQuerydictToDict(request.GET)
page, itemsPerPage = getPageDataFromDict(getParams)
getParamsWithNoPageData = createDictWithoutPageData(getParams)
data = collection.find(getParamsWithNoPageData)[page:page+itemsPerPage+1]
response = HttpResponse(data, content_type="application/json")
else:
response = HttpResponse(status=404)
return response
def convertQuerydictToDict(queryDict):
return dict(queryDict.iterlists())
def getPageDataFromDict(myDict):
if "page" in myDict and "itemsPerPage" in myDict:
page, itemsPerPage = myDict["page"], myDict['itemsPerPage']
elif "page" in myDict:
page, itemsPerPage …
Run Code Online (Sandbox Code Playgroud) 对于下面的代码:
router.use('/campaigns/:campaign_uid', cache.node_cache, api_dynamic_campaign.router);
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我有一个到另一个路由器的路由器路由,如下所示:
router.get('/data.json', campaigns);
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处理程序如下所示:
function campaigns(request, response){
var campaign = api.get_campaign_from_request(request) || request.params.campaign_uid;
api.route_handler(request, response, {"campaign":campaign});
}
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我的问题是处理程序无权访问 request.params 中的 campaign_uid。我如何访问/传递campaign_uid 给处理程序?
error: opening file '/nix/store/4h464mkqfipf04jgz4jp3bx56sdn6av0-python3.7-somepackage-1.0.0.drv': No such file or directory
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我手动删除了一些文件以尝试删除该包。但是 nix-shell 不再工作并给我上面的消息。如何解决 nix 中的问题?我想完全删除该软件包并重新安装。
另外,当我运行以下命令时:
~/sources/integration_test >>> nix-env -u python3.7-somepackagesomepackage-1.0.0
error: selector 'python3.7-somepackages-1.0.0' matches no derivations
Run Code Online (Sandbox Code Playgroud) http://jsfiddle.net/crimsonalucard/238u6/
JavaScript的:
var myModule = angular.module('myModule', []);
myModule.controller('myController', function($scope){
});
myModule.directive('addColons', function(){
return{
restrict: 'A',
require: 'ngModel',
link: function(scope, element, attr, ngModel){
ngModel.$parsers.push(addColons);
ngModel.$formatters.push(addColons);
}
};
});
function insert(text, insertion, index)
{
return text.slice(0,index) + insertion + text.slice(index);
}
function addColons(text)
{
if(text.length !== undefined)
{
console.log("length is: " + text.length);
for(var i = text.length-2; i>0; i-=2)
{
if(text.charAt(i) !== ':')
{
text = insert(text, ":", i);
}
}
}
return text;
}
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HTML:
<div ng-app="myModule">
<div ng-controller="myController">
<input add-colons …
Run Code Online (Sandbox Code Playgroud) def get_N_Partition_Permutations(xs, n):
if n == 1:
return [[xs]]
acc = []
for i in xrange(1,len(xs)):
acc += [[xs[:i]] + j for j in get_N_Partition_Permutations(xs[i:], n-1)]
return acc
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我正在尝试在下面的haskell中实现上面的函数(在Python中).
getNPartitionPermutations :: [a] -> Int -> [[[a]]]
getNPartitionPermutations xs 1 = [[xs]]
getNPartitionPermutations xs n = iter xs 1 []
where iter ys i acc
| length xs == i = acc
| otherwise =
iter ys (i+1) (elem':acc)
where elem' = map (\x -> [(take i ys)]:x) rec'
rec' = …
Run Code Online (Sandbox Code Playgroud) 我使用以下命令在 osx 上安装了 nix:
$ sh <(curl https://nixos.org/nix/install) --darwin-use-unencrypted-nix-store-volume
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按照此处的说明进行操作:
https://hydra.nixos.org/build/119559243/download/1/manual/#sect-macos-installation
我正在尝试构建一个使用 nix shell 的项目,它告诉我在名为 nix.conf 的文件中编辑一些内容。但是,项目文档是使用 linux 或 nixos 发行版设置的,因此不确定此文件在 osx 上的位置。(文档说要查看 /etc/nix/nix.conf,但该文件在 osx 中不存在)
我将连接默认为w = 0但是对于collection.update_one或collection.update_many,我想通过设置参数w = 0来设置每个操作的write_concern.相反,我收到此错误:
update_one() got an unexpected keyword argument 'w'
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这样做的正确方法是什么?我看到插入接受'w'但不接受update_one或update_many.为什么?