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Drop columns whose name contains a specific string from pandas DataFrame
...
Use the DataFrame.select method:
In [38]: df = DataFrame({'Test1': randn(10), 'Test2': randn(10), 'awesome': randn(10)})
In [39]: df.select(lambda x: not re.search('Test\d+', x), axis=1)
Out[39]:
awesome
0 1.215
1 1.247
2 0.142
3...
内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
... 总共32个vcpu。 16个table，每个5M row。
OLTP_RO测试包含5个select查询：select_ranges, select_order_ranges, select_distinct_ranges, select_sum_ranges,
可以看到在多核心或者多线程的场景下， jemalloc和tcmalloc带来的tps增加非常明显。
参考资料
glibc...
How do RVM and rbenv actually work?
... practical difference between RVM and rbenv is when the version of Ruby is selected.
rbenv:
rbenv adds a shim to the start of your path, a command with the same name as Ruby. When you type ruby at a command line the shim is run instead (because it is also called "ruby" and comes first in the path)...
LEFT JOIN vs. LEFT OUTER JOIN in SQL Server
...default is INNER if you just specify JOIN. In other words, this is legal:
SELECT *
FROM A JOIN B ON A.X = B.Y
Here's a list of equivalent syntaxes:
A LEFT JOIN B A LEFT OUTER JOIN B
A RIGHT JOIN B A RIGHT OUTER JOIN B
A FULL JOIN B A FULL OUTER JOIN B
A INNER JOIN...
jQuery Validate Plugin - How to create a simple custom rule?
...ame="' + element.name + '"]:checked').length > 0;
}, "Atleast 1 must be selected");
And you can also override the message of a rule (ie: Atleast 1 must be selected) by using the syntax data-msg-rulename="my new message".
NOTE
If you use the data-rule-rulename method then you will need to mak...
Is it possible to update a localized storyboard's strings?
...r Cocoa Touch Storyboard] file type or a [Localizable Strings] file type.
Select your base storyboard file from the Project Navigator
Find the Localization section in the File Inspector
If your file is currently a [Localizable Strings], change it to [Interface Builder Cocoa Touch Storyboard] or vic...
Is there a way to suppress warnings in Xcode?
... Easy way to get the warning code: go to the Log Navigator (Command+7), select the topmost build, expand the log (the '=' button on the right), and scroll to the bottom.
– Neal Ehardt
Jan 25 '12 at 16:46
...
What is `related_name` used for in Django?
... use for prefetch data for Many to many and many to one relationship data.
select_related is to select data from a single value relationship. Both of these are used to fetch data from their relationships from a model. For example, you build a model and a model that has a relationship with other mode...
How to change the name of the active scheme in Xcode?
...t Scheme" from the "Product" menu.
Click on the "Manage Schemes…" button
Select the scheme whose name you wish to change
Press the "Return" key
It will select the name of the scheme and allow you to edit it.
share
...
Static hosting on Amazon S3 - DNS Configuration
...site. With the AWS console ( https://console.aws.amazon.com/s3/ ) you can select your bucket, click properties, then select the "Website" tab. Click enabled and set your index document to "index.html" and your error document to "404.html". You will also need to set your bucket with access permissi...