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Does use of final keyword in Java improve the performance?
...
Usually not. For virtual methods, HotSpot keeps track of whether the method has actually been overridden, and is able to perform optimizations such as inlining on the assumption that a method hasn't been overridden - until it lo...
Finding the index of an item in a list
... complete. Some caveats about list.index follow. It is probably worth initially taking a look at the documentation for it:
list.index(x[, start[, end]])
Return zero-based index in the list of the first item whose value is equal to x. Raises a ValueError if there is no such item.
The optional argum...
.a: error adding symbols: File format not recognized 原因 - 操作系统(...
...版本Linux/GCC上编译工程时链接了高版本Linux/GCC上编译出来的库文件，导致不能识别报错。
一般地，高版本可以链接成功低版本的，反之则不能。
.a: error adding symbols: File format not recognized 原因 - 操作系统(...
...版本Linux/GCC上编译工程时链接了高版本Linux/GCC上编译出来的库文件，导致不能识别报错。
一般地，高版本可以链接成功低版本的，反之则不能。
linux,gcc
解决TortoiseSVN出错：svn there has been a problem contacting the serve...
...en a problem contacting the server在使用TortoiseSVN，查看某个文件的历史时（view log），...TortoiseSVN出错：svn there has been a problem contacting the server
在使用TortoiseSVN，查看某个文件的历史时（view log），出现上述错误。
解决方法：
[代码...
How do I create an average from a Ruby array?
...void integer division or your results will be wrong. Also, this isn't generally applicable to every possible element type (obviously, an average only makes sense for things that can be averaged). But if you want to go that route, use this:
class Array
def sum
inject(0.0) { |result, el| result...
Why do people say there is modulo bias when using a random number generator?
...AND_MAX is 10 and I decide to generate a random number between 0 and 2 by calling rand()%3. However, rand()%3 does not produce the numbers between 0 and 2 with equal probability!
When rand() returns 0, 3, 6, or 9, rand()%3 == 0. Therefore, P(0) = 4/11
When rand() returns 1, 4, 7, or 10, rand()%3 ...
Logging uncaught exceptions in Python
... global type (much like using var self = this in Javascript). It doesn't really matter unless you need to access the type object inside your function, in which case you can use type_ as the argument instead.
– Ryan P
Jan 2 '13 at 17:08
...
Is “argv[0] = name-of-executable” an accepted standard or just a common convention?
...
Guesswork (even educated guesswork) is fun but you really need to go to the standards documents to be sure. For example, ISO C11 states (my emphasis):
If the value of argc is greater than zero, the string pointed to by argv[0] represents the program name; argv[0][0] shall b...
Disable output buffering
...stdout with
some other stream like wrapper which
does a flush after every call.
class Unbuffered(object):
def __init__(self, stream):
self.stream = stream
def write(self, data):
self.stream.write(data)
self.stream.flush()
def writelines(self, datas):
self.stream....