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What's the difference between nohup and ampersand
... doesn't (except the shell is confgured that way or doesn't send SIGHUP at all).
Normally, when running a command using & and exiting the shell afterwards, the shell will terminate the sub-command with the hangup signal (kill -SIGHUP <pid>). This can be prevented using nohup, as it catche...
Html.ActionLink as a button or an image, not a link
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that is bad in all sorts of ways, it dose not work in all browsers, and you are using a side effect as functionality. witch makes it a very bad practice don't use it. Just because it works it does not make it a good solution.
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How to slice an array in Bash
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There is also a convenient shortcut to get all elements of the array starting with specified index. For example "${A[@]:1}" would be the "tail" of the array, that is the array without its first element.
version=4.7.1
A=( ${version//\./ } )
echo "${A[@]}" # 4 7 1
B...
hidden symbol ... is referenced by DSO 剖析 - C/C++ - 清泛网 - 专注C/C++及内核技术
...用如下代码即可兼容Win/Linux平台的函数导出：
#ifdef WIN32
#ifdef XXX_EXPORTS
#define XXX_API __declspace(dllexport)
#else
#define XXX_API __declspace(dllimport)
#endif
#define XXX_LOCAL
#else
#ifdef XXX_EXPORTS
#define XXX_API __attribute__ ((visibility("defaul...
Django: Get list of model fields?
...s which (ultimately) inherits from models.Model . I want to get a list of all the fields defined for this model. For example, phone_number = CharField(max_length=20) . Basically, I want to retrieve anything that inherits from the Field class.
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Is there a built-in method to compare collections?
... answered Jan 11 '11 at 8:43
Allon GuralnekAllon Guralnek
14.8k55 gold badges5151 silver badges9090 bronze badges
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How do I keep Python print from adding newlines or spaces? [duplicate]
...ys.stdout.flush()
sys.stdout.write('m')
sys.stdout.flush()
You need to call sys.stdout.flush() because otherwise it will hold the text in a buffer and you won't see it.
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How can I use a local image as the base image with a dockerfile?
...ockerfile.
I just realised that I've been using FROM with indexed images all along.
4 Answers
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Why aren't superclass __init__ methods automatically invoked?
...thon designers decide that subclasses' __init__() methods don't automatically call the __init__() methods of their superclasses, as in some other languages? Is the Pythonic and recommended idiom really like the following?
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64 bit OS下int占几个字节？ - C/C++ - 清泛网 - 专注C/C++及内核技术
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__int64才是8位的。
另外，指针是受编译器/OS影响的，32 bit编译器下int指针占4位，64 bit下int指针占8位。
写个小demo稍微验证下即可，结论：无论32/64位编译器、32/64位OS，结果都是4。
只与编译器位数有关，与OS位数无关...