python – kenneho.net

Plotly without Dash

July 11, 2021 Kenneth Holter Comments 0 Comment

While Plotly’s Dash looks like a great project for getting data visualization dashboards up and running quickly, it may not always be the best option, especially for dashboards that over time evolve into complex apps. So I’ve been looking into harnessing the power of Plotly’s excellent graphing tools, while running technologies that can grow with the app. This post will be somewhat of a note-to-self, to keep track of the viable options for utilizing Plotly on standard technology stacks. Flask…

Using AWS Cognito to authorize access to API Gateway

October 29, 2019 Kenneth Holter Comments 0 Comment

I’m writing a simple web application that at the moment basically does this: In the web app, users log in The web app contacts AWS Cognito for user authentication. In AWS Cognito, I’ve set up a user pool, think of it as a database, in which my users are stored. When a user sign in, AWS Cognito checks the user pool to verify the password. AWS Cognitor responds with different JWT tokens, including an ID token for the user The…

openpyxl’s “load_workbook” return empty list of sheets

July 8, 2019 Kenneth Holter Comments 2 comments

Consider this code: When using one of my xlsx-files as input, my code produced the output Sheet names: [] followed by this expection: After some investigating, I found that the file had been saved as “Strict Open XML Spreadsheet (xlsx)” instead of “Excel Workbook (xslx)”. Both files for some reason have the same file extension, but the former was not supported by the openpyxl library. Saving the file as “Excel Workbok (xslx)” got the code working again.

Adding “–version” parameter to “python3 setup.py”

July 4, 2019 Kenneth Holter Comments 0 Comment

When building Python packages using setuptools, you typically manually set the upcoming package version in setup.py. For my use case, I found it better to provide the version number on the command line such as this: setuptools isn’t very fond of command line parameters, so I made a quick-n-dirty hack to work around this limitation:

Python: Writing test to verify command line arguments

May 28, 2019 Kenneth Holter Comments 0 Comment

I wrote a small Python script that will be executed from the command line. After finishing the tests to verify the business logic, I decided to test the command line arguments as well, just to make sure they’re parsed correctly and passed to their appropriate places in the business logic code. Initially I was thinking I needed to write a test that executes the actual command line such as python3 myscript.py –argument=value, but as this is neither appropriate nor really…

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