I have searched a lot on the Internet, but I haven’t been able to find the solution to send an object over the socket and receive it as is. I know it needs pickling which I have already done. And that converts it to bytes and is received on the other hand. But how can I convert those bytes to
Faster bit-level data packing
An 256*64 pixel OLED display connected to Raspberry Pi (Zero W) has 4 bit greyscale pixel data packed into a byte (i.e. two pixels per byte), so 8192 bytes in total. E.g. the bytes become Converting these bytes either obtained from a Pillow (PIL) Image or a cairo ImageSurface takes up to 0.9 s when naively it…
Python comparing two lists and filtering items
I would like to do some word filtering (extracting only items in ‘keyword’ list that exist in ‘whitelist’). Here is my code so far: I want to remove every word except for ‘Cat’, ‘Dog’, and ‘Cow’ (which are in the ‘whitelist’) so that the …
How to exclude imports from automodapi output?
I am trying to use automodapi to generate documentation for my Django project. When I call automodapi like this: the output includes all imported classes and functions, e.g, the Django Model class, in the index of Functions and Classes. I would like to exclude the imports and only list those classes and funct…
Pandas: ValueError: cannot convert float NaN to integer
I get ValueError: cannot convert float NaN to integer for following: The “x” is a column in the csv file, I cannot spot any float NaN in the file, and I don’t understand the error or why I am getting it. When I read the column as String, then it has values like -1,0,1,…2000, all look v…
opencv cascade.detectMultiScale creates error: (-215) !empty()
I am following this tutorial to understand haar features. While writing following code: getting following error: (Sachin is the image i downloaded from google, of size (237,237,3) and after converting gray it is (237,237) with min=23, max=210. I am using opencv 3.1.0 with python 3.6, installed using command c…
How to generate indexes for related fields on Django models?
Say we’re building a Django-based site that clones Medium.com’s URL structure, where you have users and articles. We’d probably have this model: We want to be able to build URLs that look like /<username>/<slug>/. Since we’re going to have billions of articles and zillions …
Separating development and production dependencies with virtualenv
I have a simple flask app, where I use virtualenv for managing my dependencies. However, I would like to separate my dependencies. For testing I use Flask-Testing, but this is a dependency I wouldn’t want to include in my production environment. How can separate my dependencies, so that I have separate …
How to save an image list in PDF using PIL (pillow)?
I want use PIL .save() method for export my PIL image list to pdf. in the PIL document , saving part say: => we can use append_images option for pdf format. and in pillow’s github page , this issue say : Added append_images to PDF saving #2526 I wrote this code: but it doesn’t work! These error…
ImportError: No module named ‘spacy.en’
I’m working on a codebase that uses Spacy. I installed spacy using: and then At the end of this last command, I got a message: Now, when I try running my code, on the line: it gives me the following error: I’ve looked on Stackexchange and the closest is: Import error with spacy: “No module n…