Turn a string into a valid filename?
I have a string that I want to use as a filename, so I want to remove all characters that wouldn’t be allowed in filenames, using Python.
python
Combine Pool.map with shared memory Array in Python multiprocessing
I have a very large (read only) array of data that I want to be processed by multiple processes in parallel.
Sqlite / SQLAlchemy: how to enforce Foreign Keys?
The new version of SQLite has the ability to enforce Foreign Key constraints, but for the sake of backwards-compatibility, you have to turn it on for each database connection separately!
Pandas groupby mean – into a dataframe?
Say my data looks like this:
Pick N distinct items at random from sequence of unknown length, in only one iteration
I am trying to write an algorithm that would pick N distinct items from an sequence at random, without knowing the size of the sequence in advance, and where it is expensive to iterate over the sequence more than once. For example, the elements of the sequence might be the lines of a huge file.
Use cases for the ‘setdefault’ dict method
The addition of collections.defaultdict in Python 2.5 greatly reduced the need for dict‘s setdefault method. This question is for our collective education:
Why is bool a subclass of int?
When storing a bool in memcached through python-memcached I noticed that it’s returned as an integer. Checking the code of the library showed me that there is a place where isinstance(val, int) is checked to flag the value as an integer.
Making a request to a RESTful API using Python
I have a RESTful API that I have exposed using an implementation of Elasticsearch on an EC2 instance to index a corpus of content. I can query the search by running the following from my terminal (MacOSX):
Calling class staticmethod within the class body?
When I attempt to use a static method from within the body of the class, and define the static method using the built-in staticmethod function as a decorator, like this:
Run a program from python, and have it continue to run after the script is killed
I’ve tried running things like this: