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Repeat String - Javascript
...e-testing playground here for those who interested.
variable count ~ 0 .. 100:
constant count = 1024:
Use it and make it even faster if you can :)
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Initializing a list to a known number of elements in Python [duplicate]
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The first thing that comes to mind for me is:
verts = [None]*1000
But do you really need to preinitialize it?
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Difference between float and decimal data type
... numbers (a decimal(10,2), b float);
mysql> insert into numbers values (100, 100);
mysql> select @a := (a/3), @b := (b/3), @a * 3, @b * 3 from numbers \G
*************************** 1. row ***************************
@a := (a/3): 33.333333333
@b := (b/3): 33.333333333333
@a + @a + @a: 99.9...
How can I use if/else in a dictionary comprehension?
...es = {'name': 'Material Name', 'maxt': 'Max Working Temperature', 'ther': {100: 1.1, 200: 1.2}}
a_dic, b_dic = {}, {}
for field, value in entries.items():
if field == 'ther':
for k,v in value.items():
b_dic[k] = v
a_dic[field] = b_dic
else:
a_dic[field] ...
Length of an integer in Python
...) is already behind for even quite small numbers
timeit math.log10(2**8)
1000000 loops, best of 3: 746 ns per loop
timeit len(str(2**8))
1000000 loops, best of 3: 1.1 µs per loop
timeit math.log10(2**100)
1000000 loops, best of 3: 775 ns per loop
timeit len(str(2**100))
100000 loops, best of 3:...
time.sleep — sleeps thread or process?
...sleep(1)
class waiter(Thread):
def run(self):
for x in xrange(100,103):
print x
time.sleep(5)
def run():
worker().start()
waiter().start()
Which will print:
>>> thread_test.run()
0
100
>>> 1
2
3
4
5
101
6
7
8
9
10
102
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Check for installed packages before running install.packages() [duplicate]
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Sacha Epskamp
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answered Feb 18 '12 at 13:48
ShuguangShuguang
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What are the dangers when creating a thread with a stack size of 50x the default?
...S | G | H |
--+---------+---------+---------+
S | - | 100.80 %| 120.72 %|
--+---------+---------+---------+
G | 99.21 %| - | 119.76 %|
--+---------+---------+---------+
H | 82.84 %| 83.50 %| - |
--+---------+---------+---------+
Rates are calculated by dividing th...
App Inventor 2 列表积木完全指南：从入门到精通，一篇搞定数据存储 - App...
...单有 20 样商品，难道要建 20 个变量？一个用户通讯录有 100 条记录，难道要写 100 个变量？当然不用。列表（Lists） 就是帮你批量管理同类数据的利器。今天这篇文章，我会把 App Inventor 2 中所有列表积木的用法掰开揉碎讲清楚...
How to automatically generate N “distinct” colors?
... can distribute the hues like so:
// assumes hue [0, 360), saturation [0, 100), lightness [0, 100)
for(i = 0; i < 360; i += 360 / num_colors) {
HSLColor c;
c.hue = i;
c.saturation = 90 + randf() * 10;
c.lightness = 50 + randf() * 10;
addColor(c);
}
...