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Append column to pandas dataframe
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As pointed by @jeremy-z, it is very important to reset indexes in both dataset if they don't share same index. Otherwise you will get one dataset with lot of NaNs rows.
– Israel Varea
Jun 18 '19 at...
How long does it take for GitHub page to show changes after changing index.html
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Github pages are cached with CDN. As explained by JoelGlovier in comments, you can still have the latest version of your pages by appending a version in the query string such as https://username.github.io/awesome-repo/?version=f36af92 so that you won't get a cached versio...
Uses for Optional
...it's rather clumsy. Suppose you have a method that takes a string followed by an optional second string. Accepting an Optional as the second arg would result in code like this:
foo("bar", Optional.of("baz"));
foo("bar", Optional.empty());
Even accepting null is nicer:
foo("bar", "baz");
foo("bar...
Template default arguments
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@Pubby I suppose it would create some unnecessary complications if Foo might be a template identifier or might be an explicit instantiation depending on whether there's a default argument. Better keep the explicit instantiation s...
What is the $? (dollar question mark) variable in shell scripting? [duplicate]
...s whether it is a file or directory), you will get the return value thrown by the ls command, which should be 0 (default "success" return value). If it doesn't exist, you should get a number other then 0. The exact number depends on the program.
For many programs you can find the numbers and their ...
How to avoid null checking in Java?
... statement throws an Error (AssertionError) if the condition is not true. By default, Java ignores assertions. You can enable assertions by passing the option -ea to the JVM. You can enable and disable assertions for individual classes and packages. This means that you can validate code with the...
Difference between abstract class and interface in Python
...Creating an Abstract Base Class
We can create our own Abstract Base Class by setting the metaclass to abc.ABCMeta and using the abc.abstractmethod decorator on relevant methods. The metaclass will be add the decorated functions to the __abstractmethods__ attribute, preventing instantiation until th...
What is the correct value for the disabled attribute?
... markup.
For HTML5, <input type="text" disabled /> is valid and used by W3C on their samples.
In fact, both ways works on all major browsers.
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Convert String to SecureString
...il garbage collection). However, you can add characters to a SecureString by appending them.
var s = new SecureString();
s.AppendChar('d');
s.AppendChar('u');
s.AppendChar('m');
s.AppendChar('b');
s.AppendChar('p');
s.AppendChar('a');
s.AppendChar('s');
s.AppendChar('s');
s.AppendChar('w');
s.Appe...
How do I set the rounded corner radius of a color drawable using xml?
...ember to add padding for the start and end so the text doesn't get crowded by the rounded edge
– RowanPD
Jun 4 '17 at 15:49
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