大约有 44,000 项符合查询结果（耗时：0.0693秒） [XML]
How to get the original value of an attribute in Rails
...
243
Before rails 5.1
Appending _was to your attribute will give you the previous value.
For rails ...
How to base64 encode image in linux bash / shell
...
answered Jun 4 '13 at 13:09
chepnerchepner
357k4646 gold badges352352 silver badges475475 bronze badges
...
Any gotchas using unicode_literals in Python 2.6?
...en our code base running under Python 2.6. In order to prepare for Python 3.0, we've started adding:
6 Answers
...
In Matlab, when is it optimal to use bsxfun?
... bsxfun with R2012b on my decently fast laptop.
For me, bsxfun is about 3 times faster than repmat. The difference becomes more pronounced if the arrays get larger
The jump in runtime of repmat happens around an array size of 1Mb, which could have something to do with the size of my processor ...
Why not abstract fields?
...
folibis
9,63233 gold badges3232 silver badges7777 bronze badges
answered Feb 5 '10 at 22:59
rsprsp
...
Adding an identity to an existing column
...
|
edited Jul 23 at 11:24
Serg
2,21033 gold badges2626 silver badges3636 bronze badges
answer...
How many GCC optimization levels are there?
...n level is specified)
-O1 (optimize minimally)
-O2 (optimize more)
-O3 (optimize even more)
-Ofast (optimize very aggressively to the point of breaking standard compliance)
-Og (Optimize debugging experience. -Og enables optimizations that do not interfere with debugging. It should be t...
Press alt + numeric in bash and you get (arg [numeric]) what is that?
...nswered Feb 18 '09 at 18:00
user3850user3850
2
...
Find index of last occurrence of a substring in a string
...
Use .rfind():
>>> s = 'hello'
>>> s.rfind('l')
3
Also don't use str as variable name or you'll shadow the built-in str().
share
|
improve this answer
|
...