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How to split a dos path into its components in Python
...
I've been bitten loads of times by people writing their own path fiddling functions and getting it wrong. Spaces, slashes, backslashes, colons -- the possibilities for confusion are not endless, but mistakes are easily made anyway. So I'm a stickler f...
Git copy file preserving history [duplicate]
...this:
git blame -C -C -C dir2/A.txt
Git does not track copies at commit-time, instead it detects them when inspecting history with e.g. git blame and git log.
Most of this information comes from the answers here: Record file copy operation with Git
...
How to check if a string contains only digits in Java [duplicate]
...gex = "\\d+";
As per Java regular expressions, the + means "one or more times" and \d means "a digit".
Note: the "double backslash" is an escape sequence to get a single backslash - therefore, \\d in a java String gives you the actual result: \d
References:
Java Regular Expressions
Java Chara...
Converting an array of objects to ActiveRecord::Relation
...bjects to an ActiveRecord::Relation? Preferably without doing a where each time.
You cannot convert an Array to an ActiveRecord::Relation since a Relation is just a builder for a SQL query and its methods do not operate on actual data.
However, if what you want is a relation then:
for ActiveRec...
Is it bad practice to make a setter return “this”?
...e (including at construction)
you know which fields you need to set at the time you're writing the code, and
there are many different combinations for which fields you want to set.
Alternatives to this method might be:
One mega constructor (downside: you might pass lots of nulls or default valu...
How to create a GUID/UUID in Python
...; import uuid
>>> # make a UUID based on the host ID and current time
>>> uuid.uuid1()
UUID('a8098c1a-f86e-11da-bd1a-00112444be1e')
>>> # make a UUID using an MD5 hash of a namespace UUID and a name
>>> uuid.uuid3(uuid.NAMESPACE_DNS, 'python.org')
UUID('6fa459ea...
NGINX to reverse proxy websockets AND enable SSL (wss://)?
...e $http_upgrade;
proxy_set_header Connection "upgrade";
proxy_read_timeout 86400;
}
You can also check the nginx changelog and the WebSocket proxying documentation.
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Practical usage of setjmp and longjmp in C
...he like make longjmp()ing tricky, since you then have to setjmp() multiple times in the call stack (once for every function that needs to perform some sort of cleanup before it exits, which then needs to "re-raise the exception" by longjmp()ing to the context that it had initially received). It gets...
What is the combinatory logic equivalent of intuitionistic type theory?
I recently completed a university course which featured Haskell and Agda (a dependent typed functional programming language), and was wondering if it was possible to replace lambda calculus in these with combinatory logic. With Haskell this seems possible using the S and K combinators, thus making i...
When someone writes a new programming language, what do they write it IN?
... like human beings have, albeit in a comparatively infinitesimal amount of time.
– Gaurav Ojha
Oct 21 '16 at 11:27
Now...