Learning Python Archives - Page 2 of 654

Converting a String to a List of Words?

December 16, 2020 Andrew Rocky

Question or problem about Python programming: I’m trying to convert a string to a list of words using python. I want to take something like the following:

Segmentation fault and crashing when trying to import opencv

December 16, 2020 Aba Tayler

Question or issue on macOS: I have mac os x 10.9. I downloaded opencv-python using homebrew and I have both the python 2.7 and python 3.4 versions off of the main python site, downloaded the usual way with macs. I need to use opencv, but they do not have a download package for macs so […]

Sort a list of Class Instances Python

December 16, 2020 Abreonia Ng

Question or problem about Python programming: I have a list of class instances – x = [,…] among other attributes the class has score attribute. How can I sort the items in ascending order based on this parameter? EDIT: The list in python has something called sort. Could I use this here? How do I […]

What makes sets faster than lists?

December 16, 2020 Jeffrey Schneider

Question or problem about Python programming: The python wiki says: “Membership testing with sets and dictionaries is much faster, O(1), than searching sequences, O(n). When testing “a in b”, b should be a set or dictionary instead of a list or tuple.”

sparse 3d matrix/array in Python?

December 15, 2020 Bell Jacquise

Question or problem about Python programming: In scipy, we can construct a sparse matrix using scipy.sparse.lil_matrix() etc. But the matrix is in 2d.

Python db-api: fetchone vs fetchmany vs fetchall

December 15, 2020 Aba Tayler

Question or problem about Python programming: I just had a discussion today with some coworkers about python’s db-api fetchone vs fetchmany vs fetchall.

Python remove set from set

December 15, 2020 Aba Tayler

Question or problem about Python programming: According to my interpretation of Python 2.7.2 documentation for Built-In Types 5.7 Set Types, it should be possible to remove the elements of set A from set B by passing A to set.remove(elem) or set.discard(elem)

PIP install and Python path

December 15, 2020 Andrew Rocky

Question or issue on macOS: I am using pip install on a mac to get my python requirements for a django website.

Example of what SQLAlchemy can do, and Django ORM cannot

December 15, 2020 Abreonia Ng

Question or problem about Python programming: I’ve been doing a lot of research lately into using Pyramid with SQLAlchemy versus keeping a current application in Django. That by itself is an entire debate, but I’m not here to discuss that.

Can executables made with py2app include other terminal scripts and run them?

December 15, 2020 Jeffrey Schneider

Question or issue on macOS: So I have a nice python app for OS X that is working great. It runs an external terminal script and I would like to include that in with my python app. Ideally, I’d be able to run py2app and have this script bundled up with it into the executable […]