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Why is printing to stdout so slow? Can it be sped up?
... I experimented earlier with huge (up to 10MB with fp = os.fdopen(sys.__stdout__.fileno(), 'w', 10000000)) python-side buffers. Impact was nil. ie: still long tty delays. This made me think/realize that you just postpone the slow tty problem... when python's buffer finally flushes the tty st...
Finding quaternion representing the rotation from one vector to another
...ion is produced -- check and see for yourself).
// N.B. the arguments are _not_ axis and angle, but rather the
// raw scalar-vector components.
Quaternion(float w, Vector3 xyz);
Quaternion get_rotation_between(Vector3 u, Vector3 v)
{
// It is important that the inputs are of equal length when
...
Better way to check variable for null or empty string?
... what is the purpose of !isset() here? how is it different to is_null()?
– nickf
May 7 '10 at 13:44
2
...
What is a regular expression which will match a valid domain name without a subdomain?
...many valid edge cases that I have missed):
^((?!-))(xn--)?[a-z0-9][a-z0-9-_]{0,61}[a-z0-9]{0,1}\.(xn--)?([a-z0-9\-]{1,61}|[a-z0-9-]{1,30}\.[a-z]{2,})$
When choosing a domain validation regex, you should see if the domain matches the following:
xn--stackoverflow.com
stackoverflow.xn--com
stackov...
List comprehension: Returning two (or more) items for each item
...bda x: x + 2
>>> g = lambda x: x ** 2
>>> list(chain.from_iterable((f(x), g(x)) for x in range(3)))
[2, 0, 3, 1, 4, 4]
Timings:
from timeit import timeit
f = lambda x: x + 2
g = lambda x: x ** 2
def fg(x):
yield f(x)
yield g(x)
print timeit(stmt='list(chain.from_itera...
Substitute multiple whitespace with single whitespace in Python [duplicate]
...ce characters that are combined.
To match unicode whitespace:
import re
_RE_COMBINE_WHITESPACE = re.compile(r"\s+")
my_str = _RE_COMBINE_WHITESPACE.sub(" ", my_str).strip()
To match ASCII whitespace only:
import re
_RE_COMBINE_WHITESPACE = re.compile(r"(?a:\s+)")
_RE_STRIP_WHITESPACE = re.co...
Using “label for” on radio buttons
...ds like a clear case to use a checkbox instead :D
– T_D
Mar 13 at 15:16
Ah, no what I meant was one super-label that t...
Objective-C and Swift URL encoding
...*)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(
NULL,
(__bridge CFStringRef) unescaped,
NULL,
CFSTR("!*'();:@&=+$,/?%#[]\" "),
kCFStringEncodingUTF8));
Using Core Foundation Without ARC:
NSString *escapedString = (NSString *)CFURLCreateStringByAddingPercentEs...
Is there a MySQL option/feature to track history of changes to records?
...
For example, if you have a table like this:
CUSTOMER
---------
CUSTOMER_ID PK
CUSTOMER_NAME
CUSTOMER_ADDRESS
and you wanted to keep track over time, you would amend it as follows:
CUSTOMER
------------
CUSTOMER_ID PK
CUSTOMER_VALID_FROM PK
CUSTOMER_VALID_UNTIL PK
CUSTOMER_STAT...
KeepAwake 保持唤醒扩展：防止App被操作系统停用 · App Inventor 2 中文网
...持后台任务运行
UrsKeepAwakeServiceTest
KeepAwake_Notification
UPDReceiver
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