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Django ModelForm: What is save(commit=False) used for?
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As a "real example", consider a user model where the email address and the username are always the same, and then you could overwrite your ModelForm's save method like:
class UserForm(forms.ModelForm):
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def save(self):
# Sets username to email before saving
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Determining 32 vs 64 bit in C++
..., but was curious to know if people could think of cases where this might fail or if there is a better way to do this. Please note we are trying to do this in a cross-platform, multiple compiler environment.
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Regular expression to match DNS hostname or IP Address?
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Here: stackoverflow.com/questions/4645126/… - I explain that names that start with a digit are considered as valid as well. Also, only one dot is questionable issue. Would be great to have more feedback on that.
– BreakPhreak
Jan 10 '11 a...
What is the best way to do a substring in a batch file?
... - expands %I to a file extension only
%~sI - expanded path contains short names only
%~aI - expands %I to file attributes of file
%~tI - expands %I to date/time of file
%~zI - expands %I to size of file
%~$PATH:I - searches the directories listed in the PATH
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App Inventor 2 中的响应式设计 · App Inventor 2 中文网
...ng sizes as percentages
Fixed vs. responsive sizing
Detailed example
Special circumstances
Limitation: Drawing and animation
Responsive design and Google Play
One tricky issue in designing apps is making apps that look good on devices with scree...
实战Nginx与PHP（FastCGI）的安装、配置与优化 - 更多技术 - 清泛网 - 专注...
...如果不在这里指定IP地址，Nginx转发过来的PHP解析请求将无法被接受。
<value name="allowed_clients">127.0.0.1</value>
5.管理FastCGI进程
在配置完php-fpm后，就可以启动FastCGI进程了。启动fastcgi进程有两种方式：
/usr/local/php/bin/php-cgi --fp...
Regular expression for first and last name
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Your regex fail on 2 characters string. I think this fixed it ^[\w'\-,.]*[^_!¡?÷?¿\/\\+=@#$%ˆ&*(){}|~<>;:[\]]*$
– TKA
Aug 8 '19 at 19:23
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Linux的诞生和发展 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...。
0.02 (1991.10.5)该版本以及0.03 版是内部版本，目前已经无法找到。
0.03 (1991.10.5)
0.10 (1991.10)由Ted Ts'o 发布的Linux 内核版本。
0.11 (1991.12.8)基本可以正常运行的内核版本。
0.12 (1992.1.15)主要加入对数学协处理器的软件模拟程序。...
Data structure for loaded dice?
..., r and s, between 0 and 1. Let i = floor(r*N)+1. If qi < s then return ai else return bi. The work in the alias method is in figuring out how to produce qk, ak and bk.
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VC MFC工具栏(CToolBar)控件 - C/C++ - 清泛网 - 专注C/C++及内核技术
...如果我想在工具栏按钮显示真彩位图，上面的方法显示是无法实现的，那这个功能是如何实现呢？
SetImageList函数可以做到，既然要显示真彩位图，那就不能使用上面的工具栏资源（256色），所以一切都得到用代码实现
首先向...