Python

competing regular expressions (race condition)

I’m trying to use python PLY (lex/yacc) to parse a language called ‘GRBL’. GRBL looks something like this: The ‘G’ Codes tell a machine to ‘go’ (or move) and the coordinates say where. LEX requires us to specify a unique regular expression for every possible ‘to…

Subtract rows in a grouped Dataframe

dataframe pandas python

I have a pandas dataframe and i need to subtract rows if they have the same group. Input Dataframe: A B Value A1 B1 10.0 A1 B1 5.0 A1 B2 5.0 A2 B1 3.0 A2 B1 5.0 A2 B2 1.0 Expected Dataframe: A B Value A1 B1 5.0 A1 B2 5.0 A2 B1 -2.0 A2 B2 1.0 Logic: For example

Create subclass from superclass initializer in Python

python python-3.x

Suppose I have a class Fruit and two Subclasses of it Orange(Fruit) and Banana(fruit) Fruit has an initializer, and I pass some parameters to it. But I don’t want it to just create and return a fruit necessarily, but based upon the parameters passed to it, to possibly return one of several different sub…

How to change colors for decision tree plot using sklearn plot_tree?

matplotlib python scikit-learn

How to change colors in decision tree plot using sklearn.tree.plot_tree without using graphviz as in this question: Changing colors for decision tree plot created using export graphviz? Answer Many matplotlib functions follow the color cycler to assign default colors, but that doesn’t seem to apply here…

How do you remove an item from a dictionary by its index value?

dictionary python

I am trying to create a high score system for my game, but only want to display the top 5 high scores. I used a dictionary to store the scores and the names of the players. I want the program to remove the first score once there are more than 5 items. How do I remove items from a dictionary

Tree levels in lazy Python using “Long zip with”

breadth-first-search haskell python python-itertools tree

In this blog post about breadth-first traversal, Gibbons talks about implementing BFT with “long zip with” function Then for instance My question: My version of levels in Python is working, but my lazy version using generators is not. It’s adding an extra [] level at the end. Why? I consider…

bypandas shape (n,1) to shape (n,)

pandas python reshape

I have a pandas dataframe and I want to convert it from (n,1) to shape (n,). Probably I have to use squeeze but can’t figure out, How to. squeeze documentation I also tried z[‘0’]=z[‘0’].squeeze() but it didn’t help. How can I convert? Answer z=z.squeeze() works the best an…

Setting item to numpy array with numba doesn’t execute and it doesn’t raise any exception

numba numpy python

When I search for a solution of why the code below doesn’t run, I always conclude that it should just work. I am essentially trying to speed up the colouring of RGB images using numba. I get that the problem is with setting the item into the brushOverlay array because if I simply get the item and print …

How to send raw data in a POST request Python

post postman python python-requests

Body I’m trying to send: This is my code right now: If I run this in Postman though it works just fine: Postman screenshot Answer you can geenrate the code form postman itself