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Flatten list of lists [duplicate]
...of_lists:
for val in sublist:
flattened.append(val)
The big difference is that the list comp evaluates MUCH faster than the unraveled loop and eliminates the append calls!
If you have multiple items in a sublist the list comp will even flatten that. ie
>>> list_of_lists = [...
Android Left to Right slide animation
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If you want the transition work for whole application you can create a rootacivity and inherit it in the activity you need. In Root Activity's onCreate call overridePendingTransition with desired direction. And onStart call o...
How to insert a text at the beginning of a file?
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The flaw of this solution is that it doesn't add the text if file is empty.
– DBedrenko
Apr 16 '16 at 20:45
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show 8 more c...
Java Generics Wildcarding With Multiple Classes
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Actually, you can do what you want. If you want to provide multiple interfaces or a class plus interfaces, you have to have your wildcard look something like this:
<T extends ClassA & InterfaceB>
See the Generics Tutorial at sun.com, specifically t...
Labels for radio buttons in rails form
... to Rails, I've found this answer the one I keep coming back to. It's the gift that keeps on giving. Well, until I remember the proper syntax anyway... :)
– John Gallagher
Oct 20 '11 at 19:14
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What is the difference between “px”, “dip”, “dp” and “sp”?
What is the difference between Android units of measure?
33 Answers
33
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how do i block or restrict special characters from input fields with jquery?
...= String.fromCharCode(!event.charCode ? event.which : event.charCode);
if (!regex.test(key)) {
event.preventDefault();
return false;
}
});
share
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improve this answer
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[精华]VC++对话框程序打印及打印预览的实现 - C/C++ - 清泛网 - 专注C/C++及内核技术
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void CMyPrintPreviewDlg::OnButton1()
{
// TODO: Add your control notification handler code here
CMyFrame* pf=new CMyFrame(this);
}
2、增加新类：
用ClassWizard新建CMyFrame类（基类CFrameWnd）,功能上相当于文档/视图的应用程序的框架窗口类
用ClassWizard...
How do you stop MySQL on a Mac OS install?
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There are different cases depending on whether you installed MySQL with the official binary installer, using MacPorts, or using Homebrew:
Homebrew
brew services start mysql
brew services stop mysql
brew services restart mysql
MacPor...
How do I rename a column in a SQLite database table?
...nd also within all indexes, triggers, and views that reference the column. If the column name change would result in a semantic ambiguity in a trigger or view, then the RENAME COLUMN fails with an error and no changes are applied.
Image source: https://www.sqlite.org/images/syntax/alter-table-stm...