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App Inventor 2开发简单计算器 - App Inventor 2 中文网 - 清泛IT论坛，有思想、有深度
...出来的程序漏洞百出，那些在人类看来理所当然的逻辑，对于计算机来说，却是浑然不知，一定要将每个细节都照顾到，程序才能如你所愿地运行，否则就会出现一些莫名其妙的状况，这里要讲解的是一个只有20个按键的简易计...
Is it pythonic to import inside functions?
...rt doesn't bring in code, but brings in complex
data structures written in Python. It's kind of like a pickled piece of data
except we pickled it by hand.
This is also, more-or-less, at the top of a module
Here's what we do to make the code clearer:
Keep the modules short.
If I have all my i...
How do I download a file over HTTP using Python?
... handling. You can also do more complex stuff such as changing headers.
On Python 2, the method is in urllib2:
import urllib2
response = urllib2.urlopen('http://www.example.com/')
html = response.read()
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How to use the pass statement?
I am in the process of learning Python and I have reached the section about the pass statement. The guide I'm using defines it as being a Null statement that is commonly used as a placeholder.
...
MongoDB仿关系型数据库Group聚合例子 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
MongoDB仿关系型数据库Group聚合例子MongoDB Group,max仿关系型数据库例子，通过BsonJavaScript脚本实现。相当的SQL：select * from GroupDemo a right join (select userName,max(date) maxdate from GroupDemo group by userName) b on a date=b maxdate
namespace MongoGroupDemo
{
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记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...能问题最近忙着把一个项目从MySQL迁移到MongoDB，在导入旧数据的过程中，遇到了些许波折，犯了不少错误，但同时也学到了不少知识，遂记录下来。公...最近忙着把一个项目从MySQL迁移到MongoDB，在导入旧数据的过程中，遇到了些...
NSIS学习笔记（持续更新） - C/C++ - 清泛网 - 专注C/C++及内核技术
...stom:
;不等于1就跳到这里来了。
Q 如何保留用户原来的数据
#reserve config file.
CreateDirectory "C:\Temp20150606151700\config"
CopyFiles "$INSTDIR\config\catconfig_w.ini" "C:\Temp20150606151700\config"
# Try to remove the install directory - this will only happ...
Add text to Existing PDF using Python
I need to add some extra text to an existing PDF using Python, what is the best way to go about this and what extra modules will I need to install.
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MFC的DDX和DDV技巧 - C/C++ - 清泛网 - 专注C/C++及内核技术
MFC的DDX和DDV技巧DDX将数据成员变量同对话类模板内的控件相连接，这么就使得数据在控件之间很轻率地传输。DDV用于数据的校验，例如它能积极校验数据成员变量...DDX将数据成员变量同对话类模板内的控件相连接，这么就使得数...
[解决]MySql提示:The server quit without updating PID file(…)失败 - 数...
...g PID file(…)失败服务器症状：今天网站web页面提交内容到数据库，发现出错了，一直提交不了，数找了下原因，发现数据写不进去！第一反应，重启mysql数据库，...服务器症状：
今天网站web页面提交内容到数据库，发现出错了...