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What are good uses for Python3's “Function Annotations”
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I think this is actually great.
Coming from an academic background, I can tell you that annotations have proved themselves invaluable for enabling smart static analyzers for languages like Java. For instance, you could define semantics like state restrictio...
Why can't I inherit static classes?
...en with static methods (as they are defined on type level). How should the compiler decide to select the method to invoke?
(littleguru)
And as a valuable idea, littleguru has a partial "workaround" for this issue: the Singleton pattern.
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How to set a Django model field's default value to a function call / callable (e.g., a date relative
...ease note that since Django 1.7, usage of lambda as default value is not recommended (c.f. @stvnw comment). The proper way to do this is to declare a function before the field and use it as a callable in default_value named arg:
from datetime import datetime, timedelta
# default to 1 day from now
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Label encoding across multiple columns in scikit-learn
....apply(LabelEncoder().fit_transform)
EDIT2:
In scikit-learn 0.20, the recommended way is
OneHotEncoder().fit_transform(df)
as the OneHotEncoder now supports string input.
Applying OneHotEncoder only to certain columns is possible with the ColumnTransformer.
EDIT:
Since this answer is over a ...
Advantage of switch over if-else statement
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Use switch.
In the worst case the compiler will generate the same code as a if-else chain, so you don't lose anything. If in doubt put the most common cases first into the switch statement.
In the best case the optimizer may find a better way to generate the...
Disable assertions in Python
... is True under normal circumstances, False when optimization is requested (command line option -O).
and further
Assignments to __debug__ are illegal. The value for the built-in variable is determined when the interpreter starts.
From the usage docs:
-O
Turn on basic optimizations. T...
How does one change the language of the command line interface of Git?
...ethod without side effects, since these variables only life as long as the command takes to terminate. Try it by running $ LC_ALL="en_US" man and then $ man
– Bengt
Jun 10 '12 at 23:58
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How/When does Execute Shell mark a build as failure in Jenkins?
...kins that make it what it is. You might as well have a cron or an SVN post-commit hook call the script directly. Jenkins performing the SVN checkout itself is crucial. It allows the builds to be triggered only when there are changes (or on timer, or manual, if you prefer). It keeps track of changes ...
Which is better, return value or out parameter?
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A poor an unhelpful answer. As explained in the comments on this question, out parameters have several useful advantages. Preference between out vs return should depend on the situation.
– aaronsnoswell
Dec 17 '12 at 20:55
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Static Classes In Java
...o instance methods can be called or instance fields accessed
Note that the compiler will not prevent you from declaring an instance (non-static) member. The issue will only show up if you attempt to call the instance member
Simple example per suggestions from above:
public class TestMyStaticClass...