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Changing a specific column name in pandas DataFrame
...stion works regardless of whether it is named or unnamed, and in one line: https://stackoverflow.com/a/26336314/4355695
df.rename(columns = {list(df)[1]:'new_name'}, inplace=True)
# 1 is for second column (0,1,2..)
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How to restart Jenkins manually?
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https://support.cloudbees.com/hc/en-us/articles/216118748-How-to-Start-Stop-or-Restart-your-Instance- says IMPORTANT : Do not launch methods start|stop|restart manually as $sudo /etc/init.d/jenkins start|stop|restart beca...
Best way to select random rows PostgreSQL
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And a linked article of depez outlining several more approaches:
http://www.depesz.com/index.php/2007/09/16/my-thoughts-on-getting-random-row/
1 "large" as in "the complete table will not fit into the memory".
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Jackson serialization: ignore empty values (or null)
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Or you can use GSON [https://code.google.com/p/google-gson/], where these null fields will be automatically removed.
SampleDTO.java
public class SampleDTO {
String username;
String email;
String password;
String birthday;
S...
java.lang.ClassNotFoundException: Didn't find class on path: dexpathlist
... the issue.
I fix this by following android developers page's instruction:
https://developer.android.com/studio/build/multidex.html
First add this to gradle.build file :
defaultConfig {
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minSdkVersion 14
targetSdkVersion 21
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// Enabling multidex support.
multiDexEnab...
What guidelines for HTML email design are there? [closed]
... - you will anger 'phishing' filters (eg <a href="http://domain.tld">www.someotherdomain.tld</a> is bad)
Remember that the "fold" on webmail clients tends to be extremely high up the page (on a 1024x768 screen, most interfaces won't show more than a hundred pixels or so) - get your ident...
How to getText on an input in protractor
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This is answered in the Protractor FAQ: https://github.com/angular/protractor/blob/master/docs/faq.md#the-result-of-gettext-from-an-input-element-is-always-empty
The result of getText from an input element is always empty
This is a webdriver quirk. and elements...
When to use Vanilla JavaScript vs. jQuery?
... cross-browser support. For that may I redirect you to quirksmode:
http://www.quirksmode.org/compatibility.html
It is perhaps the most comprehensive list of what works and what doesn't work on what browser anywhere. Pay particular attention to the DOM section. It is a lot to read but the point is ...
Show pending migrations in rails
...ationError that you need to rescue)
you can use needs_migration? method:
https://apidock.com/rails/v4.0.2/ActiveRecord/Migrator/needs_migration%3F/class
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Programmatically register a broadcast receiver
... stopped the application via the Android menu (in Manage → Application). https://developer.android.com/about/versions/android-3.1.html
This is an additional security feature as the user can be sure that only the applications he started will receive broadcast intents.
So it can be understood as r...