大约有 5,880 项符合查询结果（耗时：0.0364秒） [XML]
Why is it slower to iterate over a small string than a small list?
... just
9 LOAD_CONST 6 (('a', 'b', 'c'))
as tuples are immutable. Test:
>>> python3 -m timeit '[x for x in ("a", "b", "c")]'
1000000 loops, best of 3: 0.369 usec per loop
Great, back up to speed.
For Python 2:
def list_iterate():
[item for item in ["a", "b", "c"]]
...
What is the purpose of Flask's context stacks?
...alues in a script that should be run from the shell. For example, a "setup_tables.py" script...
from myapp import app, db
# Set up models
db.create_all()
In this case, the Flask-SQLAlchemy extension knows about the app application, but during create_all() it will throw an error complaining about...
How to implement classic sorting algorithms in modern C++?
...td::not1 around a function object.
C++ Style
There is no generally acceptable C++14 style yet. For better or for worse, I closely follow Scott Meyers's draft Effective Modern C++ and Herb Sutter's revamped GotW. I use the following style recommendations:
Herb Sutter's "Almost Always Auto" and S...
Is “double hashing” a password less secure than just hashing it once?
...broken with a pre-computed dictionary attack (for example, using a Rainbow Table). Otherwise, the attacker must spend time to compute a hash for each password and see if it matches the stored hash.
All passwords are not equally likely. Attackers might exhaustively search all short passwords, but th...
Git and Mercurial - Compare and Contrast
...l for this writeup
Summary
Here it would be nice to have some syntax for table, something like in PHPMarkdown / MultiMarkdown / Maruku extension of Markdown
Repository structure: Mercurial doesn't allow octopus merges (with more than two parents), nor tagging non-commit objects.
Tags: Mercurial u...
What is move semantics?
...on unit? By contrast, the return value rule simply has to check the symbol tables to determine whether or not the identifier after the return keyword denotes an automatic object.
You can also pass the parameter by value. For move-only types like unique_ptr, it seems there is no established idiom ye...
Efficiently replace all accented characters in a string?
...
What I'm trying to do is make the sorting of the jQuery tablesorter plugin work correctly for table data in German. The plugin can take an user-defined function to extract the string to sort on, which is what I have to do or the resulting sort order will be wrong.
...
Regular expression to match non-ASCII characters?
...he knows what he's talking about.)
The way he implemented it is by adding tables of characters with certain properties. Then, when you contruct a regex with his library, \p{charclass} gets replaced with [allthecharactersintheclass].
...
构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...NOOP)
c、server以及存储引擎级别（连接管理、网络管理、table管理、日志）
包括cache/buffer、Connection、IO
d、应用级别（比如索引的考虑，schema的优化适当冗余；优化sql查询导致的CPU问题和内存问题，减少锁的范围，减少回表扫描...
How does Google Instant work?
...\x22\\x3eSimilar\\x3c/a\\x3e\\x3c/span\\x3e\\x3c/span\\x3e\\x3cbr\\x3e\\x3ctable class\\x3dslk style\\x3d\\x22border-collapse:collapse;margin-top:4px\\x22\\x3e\\x3ctr\\x3e\\x3ctd style\\x3d\\x22padding-left:14px;vertical-align:top\\x22\\x3e\\x3cdiv class\\x3dsld\\x3e\\x3ca class\\x3dsla href\\x3d\\x...