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VIP会员中心 · App Inventor 2 中文网，少儿编程陪伴者
...注：手机和电脑必须在同一局域网内，原理是电脑端启动WEB服务器，手机AI伴侣与WEB通信；电脑连手机热点，也是OK的。 扫码关注网页底部公众号，观看置顶视频，AI伴侣的各种测试方式均有讲解。 ...
How to set up Spark on Windows?
... http://spark.apache.org/docs/latest/building-spark.html
Download and install Maven, and set MAVEN_OPTS to the value specified in the guide.
But if you're just playing around with Spark, and don't actually need it to run on Windows for any other reason that your own machine is running Windows, I'd...
What is this Javascript “require”?
...es are a way to split an application into separate files instead of having all of your application in one file. This concept is also present in other languages with minor differences in syntax and behavior, like C's include, Python's import, and so on.
One big difference between Node.js modules and...
Programmatically saving image to Django ImageField
...import File # you need this somewhere
import urllib
# The following actually resides in a method of my model
result = urllib.urlretrieve(image_url) # image_url is a URL to an image
# self.photo is the ImageField
self.photo.save(
os.path.basename(self.url),
File(open(result[0], 'rb'))
...
Real world example about how to use property feature in python?
...ef protein_folding_angle(self):
# number crunching, remote server calls, etc
# all results in an angle set in 'some_angle'
# It could also reference a cache, remote or otherwise,
# that holds the latest value for this angle
return some_angle
>>> f = ...
How can I get the MAC and the IP address of a connected client in PHP?
... address, you could parse the output of netstat -ie in Linux, or ipconfig /all in Windows.
Client IP address
You can get the client IP from $_SERVER['REMOTE_ADDR']
Client MAC address
The client MAC address will not be available to you except in one special circumstance: if the client is on the s...
What should I do if the current ASP.NET session is null?
...ireRequestState runs before control is handed to your Page. So if you are calling other functionality, including static classes, from your page, you should be fine.
If you have some classes doing initialization logic during startup, for example on the Application_Start event or by using a static con...
Serializing class instance to JSON
...ps() only knows how to serialize a limited set of object types by default, all built-in types. List here: https://docs.python.org/3.3/library/json.html#encoders-and-decoders
One good solution would be to make your class inherit from JSONEncoder and then implement the JSONEncoder.default() function...
How to send HTML-formatted email? [duplicate]
...
Setting isBodyHtml to true allows you to use HTML tags in the message body:
msg = new MailMessage("xxxx@gmail.com",
"yyyy@gmail.com", "Message from PSSP System",
"This email sent by the PSSP system<br />" +
...
低效程序员的7个坏习惯 - 创意 - 清泛网 - 专注C/C++及内核技术
...工作的用户接受并持有这款应用程序。他们不将用户当作客户：他们认为用户是麻烦的根源。 “有时候，我们很难使得工程师衔接到现实世界，”Invaluable的Charles解释道，“低效的工程师会错误地表征用户体验问题为其他人的问...