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Convert base-2 binary number string to int
...'{0b1011010:#0}')
>>> bin_2_decimal
90
binary to octal hexa and etc.
>>> f'{0b1011010:#o}'
'0o132' # octal
>>> f'{0b1011010:#x}'
'0x5a' # hexadecimal
>>> f'{0b1011010:#0}'
'90' # decimal
Pay attention to 2 piece of information separated by colon.
I...
Postfix日常维护队列管理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...删除。
例如id是0EAF3A9B 那么postsuper -d 0EAF3A9B
postsuper -d ALL 删除所有邮件
显示信件列表：postqueue -p
显示信件內容：postcat -q Queue_ID
刪除各別信件：postsuper -d Queue_ID
全部刪除：postsuper -d ALL
扣住信件：postsuper -h Queue_ID
回复...
How to find the Windows version from the PowerShell command line
...o Windows 10.
Windows 10 has versions of its own: 1507, 1511, 1607, 1703, etc. This is what winver shows.
Powershell:
(Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion").ReleaseId
Command prompt (CMD.EXE):
Reg Query "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion" /v Releas...
Is it possible to specify your own distance function using scikit-learn K-Means Clustering?
...various cluster validity metrics, I came across Dunn's Index, Elbow method etc. wasn't really sure which one to utilize so thought I will start off with the Elbow method.
– Legend
Jul 11 '11 at 17:24
...
Activate a virtualenv via fabric as deploy user
...amp;& '
run(workon + 'git pull')
run(workon + 'do other stuff, etc')
Since version 1.0, Fabric has a prefix context manager which uses this technique so you can for example:
def task():
with prefix('workon myvenv'):
run('git pull')
run('do other stuff, etc')
* ...
How to write to a file in Scala?
...se a helper function:
/**
* Used for reading/writing to database, files, etc.
* Code From the book "Beginning Scala"
* http://www.amazon.com/Beginning-Scala-David-Pollak/dp/1430219890
*/
def using[A <: {def close(): Unit}, B](param: A)(f: A => B): B =
try { f(param) } finally { param.clos...
Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
...t just eats up bytes for no reason and potentially increases cache misses, etc.
The noise it makes pretty much makes timing micro-optimizations
impossible.
How can I make sure that such accidental lucky / unlucky alignments
are not interfering when I do micro-optimizations (unrelated to...
How to execute a raw update sql with dynamic binding in rails
...ure if there are other ramifications to doing this (connections left open, etc). I would trace the Rails code for a normal update to see what it's doing aside from the actual query.
Using prepared queries can save you a small amount of time in the database, but unless you're doing this a million ti...
Regex to Match Symbols: !$%^&*()_+|~-=`{}[]:";'?,./
...er class exclusion route: match everything BUT alpha, digits, white space, etc.
– Pete Alvin
Apr 29 '15 at 13:00
1
...
How does python numpy.where() work?
... operation on a numpy array returns a boolean array. (i.e. __gt__, __lt__, etc all return boolean arrays where the given condition is true).
E.g.
x = np.arange(9).reshape(3,3)
print x > 5
yields:
array([[False, False, False],
[False, False, False],
[ True, True, True]], dtyp...