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Nullable Foreign Key bad practice?
...eed for four-valued logic, and that leads to a need for five-valued logic, etc. etc. 2-valued logic is sufficient, but the data structures we get when applyiing it make "as simple as possible" still far less simple than "as simple as we'd want".
– Erwin Smout
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How do I use Ruby for shell scripting?
...l
From the site:
rush is a replacement for the unix shell (bash, zsh, etc) which uses pure Ruby syntax. Grep through files, find and kill processes, copy files - everything you do in the shell, now in Ruby
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What is the purpose of double curly braces in React's JSX syntax?
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React uses JSX, In JSX any variable, state object , expression etc has to be enclosed in {}.
While giving inline styles in JSX, it has to be specified as an object so it has to be inside curly braces again. {}.
This is the reason there are two pairs of curly braces
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Substitute multiple whitespace with single whitespace in Python [duplicate]
....split(None)) splits on sequences of whitespace (including tabs, newlines, etc, like re's \s) of length 1+ -- and it's pretty fast indeed. So, always glad to help!
– Alex Martelli
Jan 16 '10 at 16:25
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Given a view, how do I get its viewController?
...rectly a superview member variable (check parent type, remove from parent, etc). Having worked with PureMVC recently, I have become a little more nit-picky about design abstraction :) I would make parallel between iPhone's UIView and UIViewController classes and PureMVC's View and Mediator classes -...
How to handle button clicks using the XML onClick within Fragments
... could just do this:
Activity:
Fragment someFragment;
//...onCreate etc instantiating your fragments
public void myClickMethod(View v) {
someFragment.myClickMethod(v);
}
Fragment:
public void myClickMethod(View v) {
switch(v.getId()) {
// Just like you were doing
}
} ...
How do I execute inserts and updates in an Alembic upgrade script?
...al models directly will cause problems with missing columns, invalid data, etc. It's clearer to explicitly state exactly what columns and models you will use in the migration.
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Is there an easy way to pickle a python function (or otherwise serialize its code)?
...e function references globals (including imported modules, other functions etc) that you need to pick up, you'll need to serialise these too, or recreate them on the remote side. My example just gives it the remote process's global namespace.
You'll probably need to do a bit more to support more co...
Remove unwanted parts from strings in a column
...result'] = [x[1:-1] for x in df['result']]
Same rules for handling NaNs, etc, apply.
Performance Comparison
Graphs generated using perfplot. Full code listing, for your reference. The relevant functions are listed below.
Some of these comparisons are unfair because they take advantage of th...
How to delete images from a private docker registry?
... command in your docker registy container:
bin/registry garbage-collect /etc/docker/registry/config.yml
Here is my config.yml
root@c695814325f4:/etc# cat /etc/docker/registry/config.yml
version: 0.1
log:
fields:
service: registry
storage:
cache:
blobdescriptor: inmemory
fi...