大约有 3,516 项符合查询结果（耗时：0.0352秒） [XML]
If vs. Switch Speed
...tax so can generate "switch" like statements internally that have a mix of ranges, single targets, etc -- and they can (and do) do this for both switch and if..else statements.
Anyhoo, an extension to Konrad's answer is that the compiler may generate a jump table, but that's not necessarily guarant...
How to vertically center a container in Bootstrap?
...e use of Flexible box layout. Nowadays, this method is supported in a wide range of web browsers except Internet Explorer 8 & 9. Therefore we'd need to use some hacks/polyfills or different approaches for IE8/9.
In the following I'll show you how to do that in only 3 lines of text (regardless o...
How many bytes does one Unicode character take?
...
Strangely enough, nobody pointed out how to calculate how many bytes is taking one Unicode char. Here is the rule for UTF-8 encoded strings:
Binary Hex Comments
0xxxxxxx 0x00..0x7F Only byte of a 1-byte characte...
Reading binary file and looping over each byte
...b.Path(path)
pathobj.write_bytes(
bytes(random.randint(0, 255) for _ in range(2**20)))
Now let's iterate over it and materialize it in memory:
>>> l = list(file_byte_iterator(path))
>>> len(l)
1048576
We can inspect any part of the data, for example, the last 100 and first...
How does facebook, gmail send the real time notification?
...server push
alert(msg.content);
}
});
icomet supports a wide range of Browsers and OSes, including Safari(iOS, Mac), IEs(Windows), Firefox, Chrome, etc.
share
|
improve this answer
...
Select random lines from a file
...read(65536)
if not buffer: break
count += buffer.count('\n')
for i in range(10):
f.readline(random.randint(1, count))
This got me just under a minute:
$ time ./shuf.py
./shuf.py 42.57s user 16.19s system 98% cpu 59.752 total
I did this on a Lenovo X1 extreme 2nd gen wit...
Difference between int32, int, int32_t, int8 and int8_t
...
@barlop: Yes. (Both C and C++ mandate a minimum range of 255 values for char, so it requires at least 8 bits, but can be more).
– Jerry Coffin
Oct 19 '15 at 21:33
...
Why does changing the sum order returns a different result?
...to get x + y, the last 2 bits of the second number (01) are shifted out of range and do not figure into the calculation.
The second addition adds x + y and z and adds two numbers of the same scale.
Second set of additions
Here, x + z occurs first. They are of the same scale, but they yield a num...
Simple basic explanation of a Distributed Hash Table (DHT)
...is stored.
Compare this to consistent hashing. Let's define "R" as the range of a hash function. R is just some constant. In consistent hashing, the address of an object is located at hash(x)/R. Since our lookup is no longer a function of the number of buckets, we end up with less remapping w...
How do MySQL indexes work?
...ependent on the data - number of unique value and distribution across your range. 7 is the theoretical max for 100 values. Full discussion of how to calculate the number of steps here stackoverflow.com/questions/10571170/…
– Joshua
May 14 '15 at 15:44
...