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How do I uniquely identify computers visiting my web site?
...ick a
browser at random, at best we expect that only one in 286,777 other
browsers will share its fingerprint. Among browsers that support Flash
or Java, the situation is worse, with the average browser carrying at least
18.8 bits of identifying information. 94.2% of browsers wi...
String is immutable. What exactly is the meaning? [duplicate]
...the behavior of its methods." Good explanation!
– Gab是好人
Jul 21 '15 at 11:52
16
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How do I merge two dictionaries in a single expression in Python (taking union of dictionaries)?
...65235292912
>>> min(repeat(lambda: merge_two_dicts(x, y)))
1.636518670246005
>>> min(repeat(lambda: {k: v for d in (x, y) for k, v in d.items()}))
3.1779992282390594
>>> min(repeat(lambda: dict(chain(x.items(), y.items()))))
2.740647904574871
>>> min(repeat(lambda...
How to debug Lock wait timeout exceeded on MySQL?
...ct(s), heap size 3024, 8 row lock(s), undo log entries 1
MySQL thread id 3686635, query id 124164167 10.64.89.145 viget updating
DELETE FROM file WHERE file_id in ('6dbafa39-7f00-0001-51f2-412a450be5cc' )
Foreign key constraint fails for table `backoffice`.`attachment`:
,
CONSTRAINT `attachment_ib...
Should I use Vagrant or Docker for creating an isolated environment? [closed]
...
creackcreack
90.9k1111 gold badges8686 silver badges7070 bronze badges
13
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WiX tricks and tips
...or easier manipulation by an external tool.
Define Platform variables for x86 and x64 builds
<!-- Product name as you want it to appear in Add/Remove Programs-->
<?if $(var.Platform) = x64 ?>
<?define ProductName = "Product Name (64 bit)" ?>
<?define Win64 = "yes" ?>
&...
How to write iOS app purely in C
...String *delegateClassName);
// So, we rely on the fact that for both the i386 & ARM architectures,
// the registers for parameters passed in remain the same whether or not
// you are using VA_ARGS. This is actually the basis of the objective-c
// runtime (objc_msgSend), so we are probably fin...
Releasing memory in Python
...
86
Memory allocated on the heap can be subject to high-water marks. This is complicated by Python'...
Pointers vs. values in parameters and return values
...ction step but for the increase of cache misses.
Myth breaker: a typical x86 cache line are 64 bytes. Most structs are smaller than that. The time of copying a cache line in memory is similar to copying a pointer.
Only if a critical part of your code is slow I would try some micro-optimization and...
What are the differences between local branch, local tracking branch, remote branch and remote track
...
FlimmFlimm
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