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App Inventor 2 中文网原创内容 · App Inventor 2 中文网
...巧】App Inventor 2 模拟sleep函数
【技巧】App Inventor 2 过滤蓝牙设备列表
【代码简洁之道】App Inventor 2 任何(Any)代码块
【技巧】代码块导出图像，以及还原
【技巧】块拓展：参数可变
【技巧】拷贝及分享功能
【技巧】App I...
图表组件 · App Inventor 2 中文网
... 对于 距离传感器，该值应为距离。
对于 蓝牙客户端，该值表示要从该值中删除的前缀。
例如，如果值的格式为“t:12”，则前缀可以指定为“t:”，然后前缀将从数据中删除。如果是纯数值的话，则不能...
What is the iPad user agent?
...
Mozilla/5.0(iPad; U; CPU iPhone OS 3_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) Version/4.0.4 Mobile/7B314 Safari/531.21.10
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...
Can you grab or delete between parentheses in vi/vim?
...ific problem you would do the following:
printf("%3.0f\t%6.1f\n", fahr, ((5.0/9.0) * (fahr-32)));
^
Let's say your cursor is positioned at ^. Enter the following sequence to select the part you are looking for:
v2a)
First v enters Visual mode, then you specif...
Why do Chrome and IE put “Mozilla 5.0” in the User-Agent they send to the server? [duplicate]
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User agent string for Microsoft Edge: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.71 Safari/537.36 Edge/12.0 :)
– Igor Jerosimić
Jul 6 '15 at 18:42
...
Changing user agent on urllib2.urlopen
...d to scripts. For example, Mozilla Firefox may identify itself as "Mozilla/5.0 (X11; U; Linux i686) Gecko/20071127 Firefox/2.0.0.11", while urllib2‘s default user agent string is "Python-urllib/2.6" (on Python 2.6).
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ValueError: invalid literal for int() with base 10: ''
...at first, then to an integer:
>>> int('5')
5
>>> float('5.0')
5.0
>>> float('5')
5.0
>>> int(5.0)
5
>>> float(5)
5.0
>>> int('5.0')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: invalid literal ...
开源MQTT网关：EMQX vs Mosquitto - 创客硬件开发 - 清泛IT社区，为创新赋能！
...用 C/C++ 编写，采用单线程架构。Mosquitto 支持 MQTT 协议的 5.0、3.1.1 和 3.1 版本，同时支持 SSL/TLS 和 WebSockets。轻量级设计使其适合部署在嵌入式设备或资源有限的服务器上。优点：易于安装使用支持 MQTT 5.0 协议轻量高效积极的社...
Check if user is using IE
...e:
alert('IEEdge ' + detectIEEdge());
Default string of IE 10:
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0)
Default string of IE 11:
Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11.0) like Gecko
Default string of Edge 12:
Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKi...
How to rollback a specific migration?
...nal DDL. MySQL doesn't support Transactional DDL: dev.mysql.com/doc/refman/5.0/en/cannot-roll-back.html PostreSQL does: wiki.postgresql.org/wiki/… So if your migration on MySQL database is broken then you have manually to delete part of migration that succeeded.
– Иван ...