大约有 12,000 项符合查询结果（耗时：0.0212秒） [XML]
Difference between “@id/” and “@+id/” in Android
...roid:id/list">
What's the difference?
.. I'm glad you asked ☺
@+id/foo means you are creating an id named foo in the namespace of your application.
You can refer to it using @id/foo.
@android:id/foo means you are referring to an id defined in the android namespace.
The '+' means to create t...
C multi-line macro: do/while(0) vs scope block [duplicate]
...ll contexts.
Consider the following code sketch
if (<condition>)
foo(a);
else
bar(a);
where 'foo' and 'bar' are ordinary functions. Now imagine that you'd
like to replace function 'foo' with a macro of the above nature
if (<condition>)
CALL_FUNCS(a);
else
bar(a);
Now, if y...
Python: access class property from string [duplicate]
...ords:
>>> class c:
pass
o = c()
>>> setattr(o, "foo", "bar")
>>> o.foo
'bar'
>>> getattr(o, "foo")
'bar'
share
|
improve this answer
|
...
Converting an array to a function arguments list [duplicate]
...that works, why won't this work? document.body.setAttribute.apply( this, ["foo", "bar"] ); I need to send variable arguments to various object methods with different argument requirements. Quick edit: Apparently this has to be document.body, or whatever the parent is
– bryc
...
Ruby ampersand colon shortcut [duplicate]
.... The colon in this case is for the symbol. So, there's & and there's :foo.
The & calls to_proc on the object, and passes it as a block to the method. In Rails, to_proc is implemented on Symbol, so that these two calls are equivalent:
something {|i| i.foo }
something(&:foo)
Also, to_pro...
Run jar file in command prompt [duplicate]
...f you dont have an entry point defined in your manifest invoking java -jar foo.jar will not work.
Use this command if you dont have a manifest or to run a different main class than the one specified in the manifest:
java -cp foo.jar full.package.name.ClassName
See also instructions on how to cre...
How to assign multiple classes to an HTML container? [closed]
...on order. The names in the class attribute have no specified order, since .foo is syntactic sugar for [class ~= foo] ref, "foo is a word in the class attribute".
– Ulrich Schwarz
Jan 13 '14 at 16:50
...
Automatically creating directories with file output [duplicate]
...nction does this. Try the following:
import os
import errno
filename = "/foo/bar/baz.txt"
if not os.path.exists(os.path.dirname(filename)):
try:
os.makedirs(os.path.dirname(filename))
except OSError as exc: # Guard against race condition
if exc.errno != errno.EEXIST:
...
Get filename from file pointer [duplicate]
...
You can get the path via fp.name. Example:
>>> f = open('foo/bar.txt')
>>> f.name
'foo/bar.txt'
You might need os.path.basename if you want only the file name:
>>> import os
>>> f = open('foo/bar.txt')
>>> os.path.basename(f.name)
'bar.txt'
...
What do {curly braces} around javascript variable name mean [duplicate]
...e able to use this pattern to assign multiple variables at once:
{x, y} = foo;
Is the equivalent to:
x = foo.x;
y = foo.y;
This can also be used for arrays. For example, you could easily swap two values without using a temporary variable:
var a = 1;
var b = 3;
[a, b] = [b, a];
Browser s...