大约有 43,000 项符合查询结果（耗时：0.0384秒） [XML]
Reading binary file and looping over each byte
...ead, chunksize), b''), maxlen=0)
Example:
$ dd if=/dev/zero bs=1M count=1000 | python3 blackhole.py
It processes ~1.5 GB/s when chunksize == 32768 on my machine and only ~7.5 MB/s when chunksize == 1. That is, it is 200 times slower to read one byte at a time. Take it into account if you can ...
How can I install from a git subdirectory with pip?
...
I just checked and it is part of pip v1.5, released Jan 1 2014: github.com/pypa/pip/blob/develop/CHANGES.txt
– tomka
Feb 10 '14 at 14:10
20
...
Detect blocked popup in Chrome
...andler like this:
var myPopup = window.open("site-on-my-domain", "screenX=100");
if (!myPopup)
alert("failed for most browsers");
else {
myPopup.onload = function() {
setTimeout(function() {
if (myPopup.screenX === 0)
alert("failed for chrome");
}...
How to open, read, and write from serial port in C?
..."hello!\n", 7); // send 7 character greeting
usleep ((7 + 25) * 100); // sleep enough to transmit the 7 plus
// receive 25: approx 100 uS per char transmit
char buf [100];
int n = read (fd, buf, sizeof buf); // read up to 100 characters i...
Difference between method and function in Scala
...as one abstract method (it has a few concrete methods as well):
def apply(v1: T1, v2: T2): R
And that tell us all that there is to know about it. A function has an apply method which receives N parameters of types T1, T2, ..., TN, and returns something of type R. It is contra-variant on the param...
Why is require_once so bad to use?
....046600103378296
require_once 1.2219581604004 3.2908599376678
10-100× slower with require_once and it's curious that require_once is seemingly slower in hhvm. Again, this is only relevant to your code if you're running *_once thousands of times.
<?php // test.php
$LIMIT = 1000000;
...
Choosing between MEF and MAF (System.AddIn)
... does not automatically deal with versioning
MAF: Simple calculator with V1 and V2 version MAF plugins
(Managed Addin Framework)
Shows how to build up the calculator by using a V1 plugin and then how to move over to a V2 plugin while maintaining backwards-compatibility (note: you can find the V2...
What does tree-ish mean in Git?
...e86e1950b1277e545cee180551750029cfe735
| 2. <describeOutput> | v1.7.4.2-679-g3bee7fb
| 3. <refname> | master, heads/master, refs/heads/master
| 4. <refname>@{<date>} | master@{yesterday}, HEAD@{5 minutes ago}
| 5. <refname>@{<n>} | ma...
What does 'COLLATE SQL_Latin1_General_CP1_CI_AS' do?
...are some that are 90 (for SQL Server 2005, which is version 9.0), most are 100 (for SQL Server 2008, version 10.0), and a small set has 140 (for SQL Server 2017, version 14.0).
I said "for the most part" because the collations ending in _SC were introduced in SQL Server 2012 (version 11.0), but the...
Numpy - add row to array
...rt to numpy. Here are timing tests using python 3.6 vs. numpy 1.14, adding 100 rows, one at a time:
import numpy as np
from time import perf_counter, sleep
def time_it():
# Compare performance of two methods for adding rows to numpy array
py_array = [[0, 1, 2], [0, 2, 0]]
py_row = [4,...