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How to migrate back from initial migration in Django 1.7?
...lt;app> zero
This clears <app> from migration history and drops all tables of <app>
See django docs for more info.
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Can an Option in a Select tag carry multiple values?
...
I was actually wondering this today, and I achieved it by using the php explode function, like this:
HTML Form (in a file I named 'doublevalue.php':
<form name="car_form" method="post" action="doublevalue_action.php">
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Where is JAVA_HOME on macOS Mojave (10.14) to Lion (10.7)?
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With the Java optional package or Oracle JDK installed,
adding one of the following lines to your ~/.bash_profile file will set the environment variable accordingly.
export JAVA_HOME="$(/usr/libexec/java_home -v 1.6)"
or
export JAVA_HOME="$(/usr/libexec/java_home -v 1.7)...
MySQL show current connection info
... Or you could use Yousui's answer of mysql> status, which returns all of this in a single command.
– a coder
Jul 23 '14 at 20:20
2
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How to view files in binary from bash?
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...and it's preinstalled on Mac OS X and on Linux.
– Sridhar Sarnobat
Sep 5 '17 at 22:36
1
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fstream默认不支持中文路径和输出整数带逗号的解决办法 - C/C++ - 清泛网 -...
... i << "/n"; //输出带逗号
outfile.close();
setlocale( LC_ALL, "C" ); //恢复全局locale，如果不恢复，可能导致cout无法输出中文
}
创建文件成功，在程序的“测试”文件下出现个test.txt文件。需要注意的是最后需要调用setlocale( ...
MySQL和MongoDB设计实例进行对比 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...查询：
db.getCollection("mobiles").find({
"params": {
$all: [
{$elemMatch: {"name": "待机时间", "value": {$gt: 100}}},
{$elemMatch: {"name": "外观设计", "value": "直板"}}
]
}
});
注：查询中用到的$all，$elemMatch等高...
How to check if a variable is a dictionary in Python?
...t, defaultdict, or Counter from the collections module:
if isinstance(any_object, dict):
But there are even more flexible options.
Supporting abstractions:
from collections.abc import Mapping
if isinstance(any_object, Mapping):
This allows the user of your code to use their own custom implem...
github markdown colspan
...com/livedemo.html :
Works in Jupyter Markdown.
Update:
As of 2019 year all pipes in the second line are compulsory in Jupyter Markdown.
| One | Two | Three | Four | Five | Six
|-|-|-|-|-|-
| Span &lt;td colspan=3&gt;triple &lt;td colspan=2&gt;double
minimally:
One | Two | Three | ...
Create folder with batch but only if it doesn't already exist
... @jpmc26 You are right, a trailing slash does the job and is actually preferable since it works with quotes (thus allowing you to have spaces in the directory path). To distinguish between either file/directory, this will work: if exist "a" if not exist "a\" (echo "it's a file") else (echo...