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tinyxml XML解析库下载（tinyxml2.h 和 tinyxml2.cpp） - 源码下载 - 清泛...
... For example:
@verbatim
const char* value = ele->Attribute( "foo" );
@endverbatim
The 'value' parameter is normally null. However, if specified,
the attribute will only be returned if the 'name' and 'value'
match. This allow you to write code:
@verbati...
How to make a class JSON serializable
... expected output? For example, will this do?
>>> f = FileItem("/foo/bar")
>>> magic(f)
'{"fname": "/foo/bar"}'
In that case you can merely call json.dumps(f.__dict__).
If you want more customized output then you will have to subclass JSONEncoder and implement your own custom ...
Why is null an object and what's the difference between null and undefined?
...gt; var noValueYet;
> console.log(noValueYet);
undefined
> function foo(x) { console.log(x) }
> foo()
undefined
> var obj = {};
> console.log(obj.unknownProperty)
undefined
Accessing unknown variables, however, produces an exception:
> unknownVariable
ReferenceError: unknownVa...
How do I get list of methods in a Python class?
...3.x answer without external libraries
method_list = [func for func in dir(Foo) if callable(getattr(Foo, func))]
dunder-excluded result:
method_list = [func for func in dir(Foo) if callable(getattr(Foo, func)) and not func.startswith("__")]
...
How do I determine the size of an object in Python?
... casually (I should unittest it):
>>> getsize(['a', tuple('bcd'), Foo()])
344
>>> getsize(Foo())
16
>>> getsize(tuple('bcd'))
194
>>> getsize(['a', tuple('bcd'), Foo(), {'foo': 'bar', 'baz': 'bar'}])
752
>>> getsize({'foo': 'bar', 'baz': 'bar'})
400
>&...
How to get instance variables in Python?
...
Use vars()
class Foo(object):
def __init__(self):
self.a = 1
self.b = 2
vars(Foo()) #==> {'a': 1, 'b': 2}
vars(Foo()).keys() #==> ['a', 'b']
...
How to extract URL parameters from a URL with Ruby or Rails?
...te the inverse, at least not in Ruby 1.8.7 / Rails 2.3. A query string of foo[]=1&foo[]=2 is correctly parsed as { "foo" =>["1","2"] }, but build_query turns that into "foo=1&foo=2", which when parsed again yields { "foo"=>"2"}.
– Raels
Jul 20 '1...
How to run a command before a Bash script exits?
...e of using trap:
#!/bin/bash -e
function cleanup {
echo "Removing /tmp/foo"
rm -r /tmp/foo
}
trap cleanup EXIT
mkdir /tmp/foo
asdffdsa #Fails
Output:
dbrown@luxury:~ $ sh traptest
t: line 9: asdffdsa: command not found
Removing /tmp/foo
dbrown@luxury:~ $
Notice that even though the asdf...
How to send a “multipart/form-data” with requests in python?
...gt;>> response = requests.post('http://httpbin.org/post', files=dict(foo='bar'))
>>> response.status_code
200
and httpbin.org lets you know what headers you posted with; in response.json() we have:
>>> from pprint import pprint
>>> pprint(response.json()['headers'...
How to 'git pull' into a branch that is not the current one?
...pdate, and pull Git branches without using checkouts
# Merge local branch foo into local branch master,
# without having to checkout master first.
# Here `.` means to use the local repository as the "remote":
git fetch . foo:master
# Merge remote branch origin/foo into local branch foo,
# without ...