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How to git reset --hard a subdirectory?
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With Git 2.23 (August 2019), you have the new command git restore
git restore --source=HEAD --staged --worktree -- aDirectory
# or, shorter
git restore -s@ -SW -- aDirectory
That would replace both the index and working tree with HEAD content, like an reset --hard wo...
Any difference between First Class Function and High Order Function
...ring to a function, such as “a first-class function”. It’s much more common to say that “a language has/hasn’t first-class function support”.
The two things are closely related, as it’s hard to imagine a language with first-class functions that would not also support higher-order func...
Efficiently updating database using SQLAlchemy ORM
... you say
for c in session.query(Stuff).all():
c.foo = c.foo+1
session.commit()
it will do what it says, go fetch all the objects from the database, modify all the objects and then when it's time to flush the changes to the database, update the rows one by one.
Instead you should do this:
se...
Running a command in a Grunt Task
I'm using Grunt (task-based command line build tool for JavaScript projects) in my project. I've created a custom tag and I am wondering if it is possible to run a command into it.
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Pipe output and capture exit status in Bash
I want to execute a long running command in Bash, and both capture its exit status, and tee its output.
15 Answers
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Python, remove all non-alphabet chars from string
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Use re.sub
import re
regex = re.compile('[^a-zA-Z]')
#First parameter is the replacement, second parameter is your input string
regex.sub('', 'ab3d*E')
#Out: 'abdE'
Alternatively, if you only want to remove a certain set of characters (as an apostrophe mi...
Does a finally block run even if you throw a new Exception?
... (i.e. the exception will be thrown as it would in any other code). A very common case where this happens is java.sql.Connection.close().
As an aside, I am guessing that the code sample you have used is merely an example, but be careful of putting actual logic inside a finally block. The finally bl...
Groovy: what's the purpose of “def” in “def x = 0”?
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Django Rest Framework: Dynamically return subset of fields
As recommended in the blogpost Best Practices for Designing a Pragmatic RESTful API , I would like to add a fields query parameter to a Django Rest Framework based API which enables the user to select only a subset of fields per resource.
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