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Is there a performance difference between i++ and ++i in C?
...cur would be the use of iterators. Copying an iterator is unlikely to be a bottle-neck in your application, but it's still good practice to get into the habit of using ++i instead of i++ where the outcome is not affected.
sh...
Max parallel http connections in a browser?
...------------------------------ | ------------------------------ |
| Chrome 81 | 6 [^note1] | 256[^note2] |
| Edge 18 | *same as Internet Explorer 11* | *same as Internet Explorer 11* |
| Firefox 68 | 9 [^note1] or 6 [^note3] ...
How can I transform between the two styles of public key format, one “BEGIN RSA PUBLIC KEY”, the oth
..., the two numbers are:
Modulus: 297,056,429,939,040,947,991,047,334,197,581,225,628,107,021,573,849,359,042,679,698,093,131,908,015,712,695,688,944,173,317,630,555,849,768,647,118,986,535,684,992,447,654,339,728,777,985,990,170,679,511,111,819,558,063,246,667,855,023,730,127,805,401,069,042,322,76...
Split output of command by columns using Bash?
...swered Feb 16 '15 at 9:54
Xennex81Xennex81
33922 silver badges66 bronze badges
...
JSON to pandas DataFrame
...Request, urlopen
import json
import pandas as pd
path1 = '42.974049,-81.205203|42.974298,-81.195755'
request=Request('http://maps.googleapis.com/maps/api/elevation/json?locations='+path1+'&sensor=false')
response = urlopen(request)
elevations = response.read()
data = json.loads(elevations)...
Regex Pattern to Match, Excluding when… / Except between
...inspect capture groups in your code).
Thanks for all the background, zx81... But what's the recipe?
Key Fact
The method returns the match in Group 1 capture. It does not care at
all about the overall match.
In fact, the trick is to match the various contexts we don't want (chaining th...
Lambda function in list comprehensions
...(lambda x: x*x, range(10))) will give you [0, 1, 4, 9, 16, 25, 36, 49, 64, 81]
– rrlamichhane
Jun 12 at 22:58
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mysql - how many columns is too many?
...re complex select queries) to disk. This is bad, as disk i/o can be a big bottle-neck. This occurs if you have binary data (text or blob) in the query.
Wider table can lead to slower query performance.
Don't prematurely optimize, but in some cases, you can get improvements from narrower tables.
...
Finding the number of days between two dates
...
What about DST?
– toon81
Feb 6 '13 at 10:38
3
@toon81 - we use Uni...
手机当上位机：用二进制协议和设备收发数据 · App Inventor 2 中文网
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