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Flatten nested dictionaries, compressing keys
...llections import Mapping
from itertools import chain
from operator import add
_FLAG_FIRST = object()
def flattenDict(d, join=add, lift=lambda x:x):
results = []
def visit(subdict, results, partialKey):
for k,v in subdict.items():
newKey = lift(k) if partialKey==_FLAG_FI...
SQL query to group by day
...
if you're using SQL Server,
dateadd(DAY,0, datediff(day,0, created)) will return the day created
for example, if the sale created on '2009-11-02 06:12:55.000',
dateadd(DAY,0, datediff(day,0, created)) return '2009-11-02 00:00:00.000'
select sum(amount) as ...
Get DateTime.Now with milliseconds precision
..., I'd suggest using:
string timestamp = DateTime.UtcNow.ToString("yyyy-MM-dd HH:mm:ss.fff",
CultureInfo.InvariantCulture);
(Note that unlike your sample, this is sortable and less likely to cause confusion around whether it's meant to be "month/day/year...
How can I delete multiple lines in vi?
...mode"). In that context :5d would remove line number 5, nothing else. For 5dd to work as intended -- that is, remove five consequent lines starting at the cursor -- enter it in normal mode and don't prefix the commands with :.
...
Should I use Java's String.format() if performance is important?
... 747 320,504
String.format 16484 373,312
StringBuilder 769 57,344
We can see that String '+' and StringBuilder are practically identical time-wise, but StringBuilder is much more efficient in memory use.
This is very important when w...
How do you validate a URL with a regular expression in Python?
...-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[
&=~:@/])+))?(?:(?:;[Uu][Ii][Dd][Vv][Aa][Ll][Ii][Dd][Ii][Tt][Yy]=(?:[1-
9]\d*)))?)|(?:(?:(?:(?:[a-zA-Z\d$\-_.+!*'(),]|(?:%[a-fA-F\d]{2}))|[&=~
:@/])+)(?:(?:;[Uu][Ii][Dd][Vv][Aa][Ll][Ii][Dd][Ii][Tt][Yy]=(?:[1-9]\d*
)))?(?:/;[Uu][Ii][Dd]=(?:[1-9]\d*))(...
第一个Hello,OS World操作系统 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...区数
DW 18 ; 每磁道扇区数
DW 2 ; 磁头数(面数)
DD 0 ; 隐藏扇区数
DD 2880 ; 若上面“扇区总数”为0，则这个值记录扇区总数
DB 0,0,0x29 ; 中断13的驱动器号；未使用；拓展引导标记
DD 0xffffffff ; 卷序列号
DB "PFOS ...
How do I break out of a loop in Scala?
...
373
You have three (or so) options to break out of loops.
Suppose you want to sum numbers until t...
iPhone OS: How do I create an NSDate for a specific date?
...
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How to replace multiple strings in a file using PowerShell
...ce 'something3', 'something3cc' `
-replace 'something4', 'something4dd' `
-replace 'something5', 'something5dsf' `
-replace 'something6', 'something6dfsfds'
} | Set-Content $destination_file
Another option would be to assign an intermediate variable:
$x = $_ -replace 'som...