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QRCodeGenerator 拓展：根据给定的文本生成二维码 · App Inventor 2 中文网
...组件：
其他方案
也有采用 html + js + Web浏览器 生成二维码的方案：https://puravidaapps.com/qr.php
aix拓展下载
cn.fun123.QRCodeGenerator.aix
demo下载
TestQRCodeGenerator.aia
...
Android 和 App Inventor 版本兼容性问题 · App Inventor 2 中文网
...ventor Classic （中文网注：也就是 App Inventor 1 代，采用Java Web Start技术）已于 2015 年 7 月停用，详情请参阅“App Inventor Classic RIP”公告。
您的改进建议 联系方式： 不需要回复的可留空~ ...
What does `:_*` (colon underscore star) do in Scala?
...tes: MetaData, scope: NamespaceBinding,
child: Node*)
which is called as
new Elem(prefix, label, attributes, scope,
child1, child2, ... childN)
but here there is only a sequence, not child1, child2, etc. so this allows the result sequence to be used as the input to the constru...
How to read and write INI file with Python3?
...
The standard ConfigParser normally requires access via config['section_name']['key'], which is no fun. A little modification can deliver attribute access:
class AttrDict(dict):
def __init__(self, *args, **kwargs):
super(AttrDict, self).__init...
Retrieve only the queried element in an object array in MongoDB collection
...r to filter an array during projection, which has the benefit of including all matches, instead of just the first one.
db.test.aggregate([
// Get just the docs that contain a shapes element where color is 'red'
{$match: {'shapes.color': 'red'}},
{$project: {
shapes: {$filter: {
...
Python 2.7: Print to File
...
In Python 3.0+, print is a function, which you'd call with print(...). In earlier version, print is a statement, which you'd make with print ....
To print to a file in Python earlier than 3.0, you'd do:
print >> f, 'what ever %d', i
The >> operator directs pr...
how to mysqldump remote db from local machine
... a database on a remote server, but the server does not have mysqldump installed. I would like to use the mysqldump on my machine to connect to the remote database and do the dump on my machine.
...
Iterating over Java collections in Scala
...
As of Scala 2.8, all you have to do is to import the JavaConversions object, which already declares the appropriate conversions.
import scala.collection.JavaConversions._
This won't work in previous versions though.
...
List of special characters for SQL LIKE clause
What is the complete list of all special characters for a SQL (I'm interested in SQL Server but other's would be good too) LIKE clause?
...
Using module 'subprocess' with timeout
...that contains command's merged stdout, stderr data.
check_output raises CalledProcessError on non-zero exit status as specified in the question's text unlike proc.communicate() method.
I've removed shell=True because it is often used unnecessarily. You can always add it back if cmd indeed requir...