大约有 47,000 项符合查询结果（耗时：0.0705秒） [XML]
Can hash tables really be O(1)?
...
|
edited May 5 '10 at 8:21
answered May 5 '10 at 7:51
...
Python != operation vs “is not”
...
310
== is an equality test. It checks whether the right hand side and the left hand side are equal ...
Create table in SQLite only if it doesn't exist already
...
answered Nov 4 '10 at 15:06
David WoleverDavid Wolever
123k7676 gold badges297297 silver badges462462 bronze badges
...
Types in MySQL: BigInt(20) vs Int(20)
...
answered Jun 28 '10 at 20:20
Bill KarwinBill Karwin
437k7777 gold badges585585 silver badges740740 bronze badges
...
How does the Brainfuck Hello World actually work?
...
+100
1. Basics
To understand Brainfuck you must imagine infinite array of cells initialized by 0 each.
...[0][0][0][0][0]...
When bra...
How do I update if exists, insert if not (AKA “upsert” or “merge”) in MySQL?
...
10
Yeah, I believe SQL Server's equivalent is called MERGE. In general, the concept is often referred to as "UPSERT".
–...
Check if a number is int or float
...
|
edited Dec 27 '10 at 20:00
answered Dec 27 '10 at 19:16
...
Removing duplicates from a list of lists
...sort, dogroupby, donewk:
resk = f(k)
assert k == savek
print '%10s %s' % (f.__name__, sorted(resk))
Note the sanity check (performed when you just do python nodup.py) and the basic hoisting technique (make constant global names local to each function for speed) to put things on equal f...
What does `kill -0 $pid` in a shell script do?
...
answered Jun 13 '12 at 10:16
dwalterdwalter
6,30011 gold badge2626 silver badges3434 bronze badges
...
Should one use < or
... the loop.
– Jon Skeet
Apr 2 '09 at 10:22
5
Generic programming with STL iterators mandates use o...