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Why aren't python nested functions called closures?
...s in Python, and they match the definition of a closure. So why are they called nested functions instead of closures ?
...
How to use filter, map, and reduce in Python 3
... longer return lists:
[...]
map() and filter() return iterators. If you really need a list, a quick fix is e.g. list(map(...)), but a better fix is often to use a list comprehension (especially when the original code uses lambda), or rewriting the code so it doesn’t need a list at all. Particular...
How to include layout inside layout?
...sing Layouts
Although Android offers a variety of widgets to provide small and
re-usable interactive elements, you might also need to re-use larger
components that require a special layout. To efficiently re-use
complete layouts, you can use the tag to embed another
layout inside the cu...
Calling a Fragment method from a parent Activity
...per my trace it's never called. This is where I am scratching my head. I appreciate any suggestions.
– gcl1
Jun 5 '12 at 19:28
34
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How to watch for array changes?
...ent
}
return n;
}
});
1 Alternatively, if you'd like to target all arrays, you could override Array.prototype.push(). Use caution, though; other code in your environment may not like or expect that kind of modification. Still, if a catch-all sounds appealing, just replace myArray with Ar...
How to clear the interpreter console?
Like most Python developers, I typically keep a console window open with the Python interpreter running to test commands, dir() stuff, help() stuff , etc.
...
廉价共享存储解决方案1-drbd+ha+nfs - 更多技术 - 清泛网 - 专注C/C++及内核技术
...缓存的情况下可能会报目录不存在的错误，无视
yum clean all
yum makecache
3安装drbd(share1和2上操作)
3.1 准备编译环境
yum -y install gcc make automake autoconf flex rpm-build kernel-devel
3.2 上传解压源文件
利用xftp 把 drbd-8.4.6.tar.gz，d...
What optimizations can GHC be expected to perform reliably?
...has a lot of optimizations that it can perform, but I don't know what they all are, nor how likely they are to be performed and under what circumstances.
...
Why is Swift compile time so slow?
...Well, it turned out that Rob Napier was right. It was one single file (actually one method) that was causing the compiler to go berzek.
Now don't get me wrong. Swift does recompile all your files each time, but the great thing now, is that Apple added real-time compilation feedback over the files i...
performSelector may cause a leak because its selector is unknown
...for the C function pointer for the method corresponding to the controller. All NSObjects respond to methodForSelector:, but you can also use class_getMethodImplementation in the Objective-C runtime (useful if you only have a protocol reference, like id<SomeProto>). These function pointers are ...