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Comparing two dataframes and getting the differences
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This approach, df1 != df2, works only for dataframes with identical rows and columns. In fact, all dataframes axes are compared with _indexed_same method, and exception is raised if differences found, even in columns/indices order.
If I got you right, you want...
Can I change multiplier property for NSLayoutConstraint?
...line should always be the first line. because you have to deactivate one before activating the other one. or they will conflict.
zoomedConstraint.active = YES;
[self.view layoutIfNeeded]; // or using [UIView animate ...]
Swift 5.0 version
var standardConstraint: NSLayoutConstraint!
var zoomedCons...
How can I have a newline in a string in sh?
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The solution is to use $'string', for example:
$ STR=$'Hello\nWorld'
$ echo "$STR" # quotes are required here!
Hello
World
Here is an excerpt from the Bash manual page:
Words of the form $'string' are treated specially. The word expands to
string, ...
How to implement an abstract class in ruby?
...s almost always a better way). If you really think it's the best technique for the situation though, you can use the following snippet to be more declarative about which methods are abstract:
module Abstract
def abstract_methods(*args)
args.each do |name|
class_eval(<<-END, __FILE...
Fastest way to extract frames using ffmpeg?
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If the JPEG encoding step is too performance intensive, you could always store the frames uncompressed as BMP images:
ffmpeg -i file.mpg -r 1/1 $filename%03d.bmp
This also has the advantage of not incurring more quality loss through quantization by transcodi...
How do I resolve configuration errors with Nant 0.91?
...nt 0.91 zip file needed additional security related configuration to be performed: before extracting, one must right click on the zip file, select Properties and under the General tab, click the button labelled Unblock, then click OK on the Properties window. Now, extract the file to your desired lo...
PHP 错误记录和聚合的平台Sentry实战 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...会丢失旧日志中的数据，而 logtail2 不会。
<?php
require_once __DIR__ . '/raven-php/lib/Raven/Autoloader.php';
Raven_Autoloader::register();
$dsn = 'http://your/dsn';
$options = array(
'tags' => array(
'php_version' => phpversion(),
),
'trace' => f...
Useful GCC flags for C
...td=XXX , what other really useful, but less known compiler flags are there for use in C?
24 Answers
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Using Pylint with Django
I would very much like to integrate pylint into the build process for
my python projects, but I have run into one show-stopper: One of the
error types that I find extremely useful--: E1101: *%s %r has no %r
member* --constantly reports errors when using common django fields,
for example:
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Interface defining a constructor signature?
...rface and maybe cut down on the amount of refactoring needed in the future for similar situations. This concept has already been hinted at in some of the comments but I thought it would be worth showing how to actually do it.
So you have your main interface that looks like this so far:
public int...