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What are some (concrete) use-cases for metaclasses?
...
cls = type.__new__(meta, name, bases, attrs)
cls._label = 'Made in %s' % meta.__name__
return cls
attrs['__new__'] = __new__
return type.__new__(meta, name, bases, attrs)
class China(type):
__metaclass__ = MetaMetaclass
class Taiwan(type):
...
UIButton title text color
...clicked or otherwise changes state, the code in the button resets the titleLabel's properties to match the internal settings the button has for that state.
– psycotica0
Jan 17 '14 at 17:03
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Get class name of django model
...ct_name)
# Book
print(Book._meta.model_name)
# book
print(Book._meta.app_label)
# my_app
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C++使用OLE/COM高速读写EXCEL的源码 - C/C++ - 清泛网 - 专注C/C++及内核技术
...el作为OLE/COM库插件，定义好了各类交互的接口，这些接口是跨语言的接口。VC可以通过导入这些接口，并通过接口来对Excel的操作。
由于本文只关心对Excel表格中的数据的读取，主要关注几个_Application、Workbooks、_Workbook、Worksheets...
How to delete duplicate lines in a file without sorting it in Unix?
... line from input stream or file and print it once.
use :loop command set a label named loop.
use N to read next line into the pattern space.
use s/^(.*)\n\1$/\1/ to delete current line if the next line is same with current line, we use s command to do the delete action.
if the s command is executed ...
Activity restart on rotation Android
...ty"
android:configChanges="orientation|keyboardHidden"
android:label="@string/app_name">
or for Android 3.2 (API level 13) and newer:
<activity android:name=".MyActivity"
android:configChanges="keyboardHidden|orientation|screenSize"
android:label="@string/app_name"&g...
Multiple submit buttons on HTML form – designate one button as default [duplicate]
... tabindex="-1"></button>
<div class="form-group">
<label for="test-input">Focus into this input: </label>
<input type="text" id="test-input" class="form-control" name="test-input" placeholder="Focus in here and press enter / go" />
</div>
1st butt...
Calculating distance between two points, using latitude longitude?
...s a and c? Are these the sides of a right-angled triangle with traditional labels a, b and c?
– AlainD
Jan 31 '17 at 15:30
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Create a menu Bar in WPF?
...Left" Width="140"/>
</MenuItem>
</Menu>
<Label Content="Label"/>
</StackPanel>
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What is the difference between -viewWillAppear: and -viewDidAppear:?
...e view was loaded into memory. So for example, if my view is a form with 3 labels, I would add the labels here; the view will never exist without those forms.
2) ViewWillAppear: I use ViewWillAppear usually just to update the data on the form. So, for the example above, I would use this to actually...