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Elements order in a “for (… in …)” loop
...d make it clear what happens:
var obj = {
"first":"first",
"2":"2",
"34":"34",
"1":"1",
"second":"second"
};
for (var i in obj) { console.log(i); };
// Order listed:
// "1"
// "2"
// "34"
// "first"
// "second"
The technicalities of this are less important than the fact that this may chan...
List comprehension rebinds names even after scope of comprehension. Is this right?
...omprehensions leak the loop control variable in Python 2 but not in Python 3. Here's Guido van Rossum (creator of Python) explaining the history behind this:
We also made another change in Python
3, to improve equivalence between list
comprehensions and generator
expressions. In Python 2,...
App Inventor 2 数学代码块 · App Inventor 2 中文网
... ( ^ )
返回第一个数字的第二个数字次幂的结果。比如2^3 = 222 = 8
随机整数 (random integer)
返回给定值之间（包含首尾）的随机整数值。参数的顺序不限，也就是 1~100 和 100~1 效果一样。
随机小数 (random fraction)
返回 0 到 1 ...
How do I profile memory usage in Python?
...
123
This one has been answered already here: Python memory profiler
Basically you do something like...
How to install latest version of git on CentOS 7.x/6.x
...
362
You can use WANDisco's CentOS repository to install Git 2.x: for CentOS 6, for CentOS 7
Inst...
How to split a sequence into two pieces by predicate?
...
By using partition method:
scala> List(1,2,3,4).partition(x => x % 2 == 0)
res0: (List[Int], List[Int]) = (List(2, 4),List(1, 3))
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...
Repeat each row of data.frame the number of times specified in a column
...), 1:2]
Result:
var1 var2
1 a d
2 b e
2.1 b e
3 c f
3.1 c f
3.2 c f
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What is the full path to the Packages folder for Sublime text 2 on Mac OS Lion
...
357
/Users/{user}/Library/Application Support/Sublime Text 2/Packages
Get to it quickly from with...
How to check if type of a variable is string?
...d to test whether an object is an instance of str or unicode.
In Python 3.x, the correct test is
isinstance(s, str)
The bytes class isn't considered a string type in Python 3.
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