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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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ros 基本调试 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...e从而知道哪些代码出现了问题。
此方式是通过在代码中调用KeBugCheck()或ASSERT()来实现的。
生成backtrace
欲生成backtrace，需要进入KDBG的命令提示状态，输入”bt”,并按<return>键，会得到如下结果：
(drivers\filesystems\vfat\rw.c:809) <\Re...
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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C语言结构体里的成员数组和指针 - C/C++ - 清泛网 - 专注C/C++及内核技术
...面做了二次内存分配，并把整个结构体返回给用户。用户调用free可以释放结构体，但是用户并不知道这个结构体内的成员也需要free，所以你不能指望用户来发现这个事。所以，如果我们把结构体的内存以及其成员要的内存一次...
C/C++中的段错误（Segmentation fault） - C/C++ - 清泛网 - 专注C/C++及内核技术
...段错误可能出现的位置：通过扑获SIGSEGV信号来触发系统调用gdb来输出调试信息。如果加上上 面提到的条件编译，那我们就可以非常方便的进行段错误的调试拉。
清泛网注：出现段错误的时候，使用 'bt' 命令即可查看堆栈信...
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...
ListCtrl 重绘（Custom Draw） - C/C++ - 清泛网 - 专注C/C++及内核技术
...画处理函数”就会在Windows画完整个Item或者SubItem的时候被调用，你就可以随心所欲的乱画了！！
在这个例子里，我将创建一个ListCtrl，一般的ListCtrl的Item如果被选择了，则其Icon也会呈现出被选择的状态。而我创建的这个ListCtr...
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
%~$PATH:I - searches the directories listed in the PATH
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App Inventor 2 中的响应式设计 · App Inventor 2 中文网
...ng sizes as percentages
Fixed vs. responsive sizing
Detailed example
Special circumstances
Limitation: Drawing and animation
Responsive design and Google Play
One tricky issue in designing apps is making apps that look good on devices with scree...
Regular expression for first and last name
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Your regex fail on 2 characters string. I think this fixed it ^[\w'\-,.]*[^_!¡?÷?¿\/\\+=@#$%ˆ&*(){}|~<>;:[\]]*$
– TKA
Aug 8 '19 at 19:23
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