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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 sema...
How do I append one string to another in Python?
...yBytes_Concat(pv, w);
Py_XDECREF(w);
}
/* The following function breaks the notion that strings are immutable:
it changes the size of a string. We get away with this only if there
is only one module referencing the object. You can also think of it
as creating a new string object and...
How to add column if not exists on PostgreSQL?
...y when x column doesn't exist ? I found only solution here how to check if column exists.
11 Answers
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How to write DataFrame to postgres table?
There is DataFrame.to_sql method, but it works only for mysql, sqlite and oracle databases. I cant pass to this method postgres connection or sqlalchemy engine.
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Advantage of switch over if-else statement
...s compares and jumps in the average case) or simply build a jump-table (works without compares at all).
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Disable assertions in Python
... example:
$ python -Oc "assert False"
$ python -c "assert False"
Traceback (most recent call last):
File "<string>", line 1, in <module>
AssertionError
Note that by disable I mean it also does not execute the expression that follows it:
$ python -Oc "assert 1/0"
$ python -c "asse...
Python's “in” set operator
... also means hash(b) == hash(x), so equality of the items isn't enough to make them the same.
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How/When does Execute Shell mark a build as failure in Jenkins?
...t absolutely has to be said:
If you have a shell script that does "checkout, build, deploy" all by itself, then why are you using Jenkins? You are foregoing all the features of Jenkins that make it what it is. You might as well have a cron or an SVN post-commit hook call the script directly. Jen...
Which is better, return value or out parameter?
If we want to get a value from a method, we can use either return value, like this:
17 Answers
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Simplest/Cleanest way to implement singleton in JavaScript?
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I think the easiest way is to declare a simple object literal:
var myInstance = {
method1: function () {
// ...
},
method2: function () {
// ...
}
};
If you want private members on your singleton instance, you ca...