大约有 45,000 项符合查询结果（耗时：0.0513秒） [XML]
django: BooleanField, how to set the default value to true?
...
If you're just using a vanilla form (not a ModelForm), you can set a Field initial value ( https://docs.djangoproject.com/en/2.2/ref/forms/fields/#django.forms.Field.initial ) like
class MyForm(forms.Form):
my_field = fo...
C++实现一款简单完整的聊天室服务器+客户端 - C/C++ - 清泛网 - 专注C/C++及内核技术
...线程从缓冲区中取出消息
MessageBuffer.h
//MessageBuffer.h
#ifndef _MESSAGE_BUF_INCLUDE_
#define _MESSAGE_BUF_INCLUDE_
#include <pthread.h>
#define MESSAGE_COUNT 16
#define MESSAGE_LENGTH 2048
class MessageBuffer{
private:
pthread_mutex_t mutex;//访问缓冲的互斥量
pt...
How to record webcam and audio using webRTC and a server-based Peer connection
....css">
<h1> MediaRecorder API example</h1>
<p>For now it is supported only in Firefox(v25+) and Chrome(v47+)</p>
<div id='gUMArea'>
<div>
Record:
<input type="radio" name="media" value="video" checked id='mediaVideo'>Video
<input...
Reverse a string in Python
... It works by doing [begin:end:step] - by leaving begin and end off and specifying a step of -1, it reverses a string.
share
|
improve this answer
|
follow
|
...
Is there a generator version of `string.split()` in Python?
...ra memory). This did not result in a noticeable growth of memory (that is, if there was a growth in memory, it was far far less than the 1GB string).
share
|
improve this answer
|
...
What is Func, how and when is it used
...e to leverage the same code representing a pattern (with Select) with two different functions (p => p.Name and p => p.Age).
The alternative would be to write a different version of Select every time you wanted to scan a sequence for a different kind of value. So to achieve the same effect as ...
How to check if all elements of a list matches a condition?
...a generator expression where appropriate):
>>> [x for x in items if x[2] == 0]
[[1, 2, 0], [1, 2, 0]]
If you want to check at least one element is 0, the better option is to use any() which is more readable:
>>> any(flag == 0 for (_, _, flag) in items)
True
...
About .bash_profile, .bashrc, and where should alias be written in? [duplicate]
...!), shell options with set and shopt, etc. For an example, see: My .bashrc
Now, as part of UNIX peculiarity, a login-shell does NOT execute ~/.bashrc but only ~/.profile or ~/.bash_profile, so you should source that one manually from the latter. You'll see me do that in my ~/.profile too: source ~/...
How to select label for=“XYZ” in CSS?
...
And now the jQuery docs say you don't need the quotes for single words, so it matches CSS again (in this regard).
– T.J. Crowder
Jun 25 '12 at 17:39
...
How do I print a list of “Build Settings” in Xcode project?
... com.apple.compilers.llvm.clang.1_0
GCC_VERSION_IDENTIFIER com_apple_compilers_llvm_clang_1_0
GCC_WARN_ABOUT_RETURN_TYPE YES
GCC_WARN_UNUSED_FUNCTION YES
GCC_WARN_UNUSED_VARIABLE YES
GENERATE_MASTER_OBJECT_...