TLDR; Of the various compression algorithms available in python gzip, bz2, lzma, etc, which has the best decompression performance? Full discussion: Python 3 has various modules for compressing/decompressing data including gzip, bz2 and lzma. gzip and bz2 additionally have different compression levels you can set. If my goal is to balance file size (/compression ratio) and decompression speed (compression speed
Dependencies validation using Cerberus
Am validating a CSV file with Cerberus but am struggling with what I’d assume is some basic logic Scenario: A CSV file has 2 columns. Column 2 requires to have a value only if Column 1 has a value. If Column 1 is empty then Column 2 should also be empty. Am thinking this would be one of the most
How to pass parameters to Airflow on_success_callback and on_failure_callback
I have implemented email alerts on success and failure using on_success_callback and on_failure_callback. According to Airflow documentation, a context dictionary is passed as a single parameter to this function. How can I pass another parameter to these callback methods? Here is my code I intend to move the callbacks to another package and pass the email address as parameter. Answer
How to remove small particle background noise from an image?
I’m trying to remove gradient background noise from the images I have. I’ve tried many ways with cv2 without success. Converting the image to grayscale at first to make it lose some gradients that may help to find the contours. Does anybody know of a way to deal with this kind of background? I even tried taking a sample from
Windows compatibility: Permissions?
OS Windows 10, I am using Docker Engine version 18.09.2, the API version is 1.39 The website explaining the steps to run CAT is: https://libraries.io/pypi/medcat I am building the medcat image locally. Output looks good until the end of the build process: When I am trying to start the container I just built, I get: Does anyone have experience with
How to parse arguments in python (spyder)?
I am following this tutorial and trying to run the below part of the script. I am using python 3.7 and spyder 3.3.4. I have tried going to Run > Configuration per file and entering the arguments as advised by this post and and this post. command line options: path1, path2, path3, path4 I filled out the appropriate paths for
How to open a Tkinter askopenfilename dialog compatible with Python 2 and Python 3
I’m trying to write a simple Python Tkinter file chooser that is compatible both with Python2.7 and Python3.x Python3 Version Python2.7 Version How can I come up with a unified solution? Answer Try to import Tk and askopenfilename as for Python 3.x at first. If you get an ImportError (there is no tkinter and tkinter.filedialog modules), try to import them
How to create a Pandas DataFrame from dictionary of dataframes?
I have a dictionary that is a list of dataframes that have all the same columns and data structure. I am wanting to essentially ‘union’ all of these into a single dataframe again, where the dictionary keys are converted into another column: df_list{} …and so on but am wanting: I tried using pd.DataFrame.from_dict() but either I am not using it
How to uppercase even letter and lowercase odd letter in a string?
I am creating a function that takes in a string and returns a matching string where every even letter is uppercase and every odd letter is lowercase. The string only contains letters I tried a for loop that loops through the length of the string with an if statement that checks if the index is even to return an upper
Discord.py (rewrite): Error Handling “Improper Token” In Function
I feel like I’m missing a simple way to solve this problem, but I can’t seem to find a way to handle the discord.errors.LoginFailure: Improper token has been passed. error. What I’m trying to do is run a function that essentially runs a bot and repeats itself if it comes across any errors (with try: and except:) and if it