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Fastest way to get the first object from a queryset in django?
... @Ben: QuerySet.__nonzero__() is never called since the QuerySet is converted to a list before checking for trueness. Other exceptions may still occur however.
– Ignacio Vazquez-Abrams
Feb 26 '11 at 0:07
...
How to “properly” print a list?
...f the steps in @TokenMacGuy's one-liner. First he uses the map function to convert each item in the list to a string (actually, he's making a new list, not converting the items in the old list). Then he's using the string method join to combine those strings with ', ' between them. The rest is just ...
How do I sort a list by different parameters at different timed
...parator implements Comparator<Person> {
ID_SORT {
public int compare(Person o1, Person o2) {
return Integer.valueOf(o1.getId()).compareTo(o2.getId());
}},
NAME_SORT {
public int compare(Person o1, Person o2) {
return o1.getFullName().comp...
Any idea why I need to cast an integer literal to (int) here?
...
The compiler tries to subtract 128 from (Integer) instead of casting -128 to Integer. Add () to fix it
Integer i3 = (Integer) -128; // doesn't compile
Integer i3 = (Integer) (-128); // compiles
According to BoltClock in the comments the cast to int works as inte...
编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...
...部的秘密--微软的编译器是如何解析Try/Catch/Throw的Compiler-Internals-How-Try-Catch-Throw-are-Interprpreted-by-the-Microsoft-Compiler编译器 解析 Try Catch Throw本文不是一篇介绍如何在x86架构上详细地实现异常处理(exception handling)的手册，只是一篇入...
编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...
...部的秘密--微软的编译器是如何解析Try/Catch/Throw的Compiler-Internals-How-Try-Catch-Throw-are-Interprpreted-by-the-Microsoft-Compiler编译器 解析 Try Catch Throw本文不是一篇介绍如何在x86架构上详细地实现异常处理(exception handling)的手册，只是一篇入...
编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...
...部的秘密--微软的编译器是如何解析Try/Catch/Throw的Compiler-Internals-How-Try-Catch-Throw-are-Interprpreted-by-the-Microsoft-Compiler编译器 解析 Try Catch Throw本文不是一篇介绍如何在x86架构上详细地实现异常处理(exception handling)的手册，只是一篇入...
编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...
...部的秘密--微软的编译器是如何解析Try/Catch/Throw的Compiler-Internals-How-Try-Catch-Throw-are-Interprpreted-by-the-Microsoft-Compiler编译器 解析 Try Catch Throw本文不是一篇介绍如何在x86架构上详细地实现异常处理(exception handling)的手册，只是一篇入...
编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...
...部的秘密--微软的编译器是如何解析Try/Catch/Throw的Compiler-Internals-How-Try-Catch-Throw-are-Interprpreted-by-the-Microsoft-Compiler编译器 解析 Try Catch Throw本文不是一篇介绍如何在x86架构上详细地实现异常处理(exception handling)的手册，只是一篇入...
编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...
...部的秘密--微软的编译器是如何解析Try/Catch/Throw的Compiler-Internals-How-Try-Catch-Throw-are-Interprpreted-by-the-Microsoft-Compiler编译器 解析 Try Catch Throw本文不是一篇介绍如何在x86架构上详细地实现异常处理(exception handling)的手册，只是一篇入...