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When splitting an empty string in Python, why does split() return an empty list while split('\n') re
...mizing the one for no arguments more than the one with arguments; I don't know.
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What are the best practices for catching and re-throwing exceptions?
...database!";
die;
}
Logging or partial cleanup
Sometimes you do not know how to properly handle an exception inside a specific context; perhaps you lack information about the "big picture", but you do want to log the failure as close to the point where it happened as possible. In this case, yo...
Fix warning “Capturing [an object] strongly in this block is likely to lead to a retain cycle” in AR
...ializer] deserialize:request.responseData error:nil];
// ...
}];
If you want to also target iOS 4, use __unsafe_unretained instead of __weak. Same behavior, but the pointer stays dangling instead of being automatically set to nil when the object is destroyed.
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Change a Django form field to a hidden field
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If you have a custom template and view you may exclude the field and use {{ modelform.instance.field }} to get the value.
also you may prefer to use in the view:
form.fields['field_name'].widget = forms.HiddenInput()
but...
iOS开发调试技巧总结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...令】
Xcode中使用llvm编译器，公认为最好的C、C++、OC、Swift编译器。而lldb是llvm中的调试器，我们可以使用一些简单的命令进行调试，我还是把上面的循环代码作为测试代码。
断点调试中，使用po命令、print命令在Console控制台打...
Rename multiple files based on pattern in Unix
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+1 Didn't even know about rename ... Now I can stop using a for loop with mv and sed ... Thanks!
– balpha
Jul 6 '09 at 11:27
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How to get a Static property with Reflection
... key for me was to use the .FlattenHierarchy BindingFlag. I don't really know why I just added it on a hunch and it started working. So the final solution that allows me to get Public Instance or Static Properties is:
obj.GetType.GetProperty(propName, Reflection.BindingFlags.Public _
Or Reflect...
浅析为什么char类型的范围是 -128~+127 - C/C++ - 清泛网 - 专注C/C++及内核技术
...就先不探讨了。。
那么
unsigned char a= -1;
if( 1>a) printf("大于");
else
printf("小于");
结果是什么呢？ 出人意料的是： 小于，而不是大于，猫腻在你哪呢，还是存储问题：
a为unsigned 无符号...
OceanBase使用libeasy原理源码分析：客户端 - 数据库(内核) - 清泛网 - 专...
... EASY_MESSAGE_SESSION_HEADER;
ev_tstamp timeout, now;
ev_timer timeout_watcher;
// 用于串入session list的链表节点
easy_list_t session_list_node;
//为了快速根据packet id定位到发送队列中的session...
Remove duplicate lines without sorting [duplicate]
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Now you can check out this small tool written in Rust: uq.
It performs uniqueness filtering without having to sort the input first, therefore can apply on continuous stream.
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