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PHP shell_exec() vs exec()
...elen:1000 \n RX bytes:13151177627 (13.1 GB) TX bytes:2779457335 (2.7 GB)\n"...
> exec('ifconfig')
string(0) ""
Note that use of the backtick operator is identical to shell_exec().
Update: I really should explain that last one. Looking at this answer years later even I don't know why ...
Accessing dict keys like an attribute?
... inherited and another one in __dict__
Causes a memory leak in Python < 2.7.4 / Python3 < 3.2.3
Pylint goes bananas with E1123(unexpected-keyword-arg) and E1103(maybe-no-member)
For the uninitiated it seems like pure magic.
A short explanation on how this works
All python objects internally ...
Is python's sorted() function guaranteed to be stable?
...hen by salary grade).
This part of the documentation was added to Python 2.7 and Python 3.4(+) so any compliant implementation of that language version should have a stable sorted.
Note that for CPython the list.sort has been stable since Python 2.3
Tim Peters rewrote his list.sort() imple...
Difference between method and function in Scala
...
Scala will expand that, assuming m type is (List[Int])AnyRef into (Scala 2.7):
val f = new AnyRef with Function1[List[Int], AnyRef] {
def apply(x$1: List[Int]) = this.m(x$1)
}
On Scala 2.8, it actually uses an AbstractFunction1 class to reduce class sizes.
Notice that one can't convert the o...
Is 0 a decimal literal or an octal literal?
... word "token" is defined syntactically by the C (N1570 6.4) and C++ (C++11 2.7 [lex.token]) standards. 0x does not qualify. (At least in C, it is a preprocessing number (N1570 6.4.8) if it's not part of a hexadecimal constant, but that's not a token.)
– Keith Thompson
...
Python: Select subset from list based on index set
...he first option is equivalent to itertools.compress available since Python 2.7/3.1. See @Gary Kerr's answer.
property_asel = list(itertools.compress(property_a, good_objects))
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improve this...
Python: print a generator expression?
...
Basically all the other comprehensions available in Python 3 and Python 2.7 is just syntactic sugar around a generator expression. Set comprehensions:
>>> {x*x for x in range(10)}
{0, 1, 4, 81, 64, 9, 16, 49, 25, 36}
>>> set(x*x for x in range(10))
{0, 1, 4, 81, 64, 9, 16, 49,...
30岁之后，程序员该向什么方向发展？ - 杂谈 - 清泛网 - 专注C/C++及内核技术
...些产品的前端框架用的是mootools，用得人比较少。有一次我在Github上找到一个mootools的插件，很久没维护了。但是使用过程中发现一些问题，反复测试确认后，怀着忐忑的心情，我向原地址提交了commit，没想到他很快就合并了，...
What is the difference between `sorted(list)` vs `list.sort()`?
...can see here, we've disproven an older list creation expense myth:
Python 2.7
>>> timeit.repeat("next(shuffled_iter).sort()", setup=setup, number = 1000)
[3.75168503401801, 3.7473005310166627, 3.753129180986434]
>>> timeit.repeat("sorted(next(shuffled_iter))", setup=setup, number...
How do you create nested dict in Python?
...913 25.3754 13.913C26.5612 13.913 27.4607 13.4902 28.1109 12.6616C28.1109 12.7229 28.1161 12.7799 28.121 12.8346C28.1256 12.8854 28.1301 12.9342 28.1301 12.983C28.1301 14.4373 27.2502 15.2321 25.777 15.2321C24.8349 15.2321 24.1352 14.9821 23.5661 14.7787C23.176 14.6393 22.8472 14.5218 22.5437 14.521...