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How to pass a user defined argument in scrapy spider
... def parse(self, response)
self.log(self.domain) # system
Taken from the Scrapy doc: http://doc.scrapy.org/en/latest/topics/spiders.html#spider-arguments
Update 2013: Add second argument
Update 2015: Adjust wording
Update 2016: Use newer base class and add super, thanks @Birla
Update ...
Difference between namespace in C# and package in Java
...
From: http://www.javacamp.org/javavscsharp/namespace.html
Java
Packages are used to organize files or public types to avoid type conflicts. Package constructs can be mapped to a file system.
system.security.cryptography....
Saving utf-8 texts in json.dumps as UTF8, not as \u escape sequence
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As of Python 3.7 the following code works fine:
from json import dumps
result = {"symbol": "ƒ"}
json_string = dumps(result, sort_keys=True, indent=2, ensure_ascii=False)
print(json_string)
Output:
{"symbol": "ƒ"}
...
Difference between freeze and seal
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Object.seal
It prevents adding and/or removing properties from the sealed object; using delete will return false
It makes every existing property non-configurable: they cannot be converted from 'data descriptors' to 'accessor descriptors' (and vice versa), and no attribute of access...
What is the difference between packaged_task and async
...c and ~future, which describes the problem, and Scott Meyer's std::futures from std::async aren't special, which describes the insights. Also do note that this behavior was specified in C++14 and up, but also commonly implemented in C++11.
Further differences
By using std::async you cannot run you...
What is the difference between a regular string and a verbatim string?
...teral were used.
There is no difference at runtime between strings created from regular string literals and strings created from a verbatim string literals - they are both of type System.String.
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iFrame src change event detection?
...on(){
alert('frame has (re)loaded');
});
As mentioned by subharb, as from JQuery 3.0 this needs to be changed to:
$('#iframe').on('load', function() {
alert('frame has (re)loaded ');
});
https://jquery.com/upgrade-guide/3.0/#breaking-change-load-unload-and-error-removed
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async await return Task
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async methods are different than normal methods. Whatever you return from async methods are wrapped in a Task.
If you return no value(void) it will be wrapped in Task, If you return int it will be wrapped in Task<int> and so on.
If your async method needs to return int you'd mark the ...
How to use java.net.URLConnection to fire and handle HTTP requests?
... set the cookie headers. You basically need to grab all Set-Cookie headers from the response of the login or the first GET request and then pass this through the subsequent requests.
// Gather all cookies on the first request.
URLConnection connection = new URL(url).openConnection();
List<String&...
Maven: add a dependency to a jar by relative path
...to be in a 3rdparty lib in source control, and link to it by relative path from the pom.xml file.
If you really want this (understand, if you can't use a corporate repository), then my advice would be to use a "file repository" local to the project and to not use a system scoped dependency. The sy...