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Python Default Parameter Gotcha

  • September 8, 2019
  • Python

Take a look at this code. All it does is return a list with appended parameter. In case no list is supplied, it defaults to an empty list and appends to it. Or is it???

Look at the second result. We expected [“silver”] expecting the item to be appended to an empty list as […]




Analyzing IRIS Dataset With Keras and Tensorflow – Machine Learning and Data Analysis

We will analyze the famous IRIS dataset. Before we start, here are the basic steps that any typical Machine Learning based Data Analysis workflow consists of. (Note: if text inside figure appears small, please increase the font size temporarily by Ctrl+roll-mouse-scroller) Most of our time will be spent in Phases 1 and 2. Source code […]




Python Linting – Flake8

Linting is a must for any python project. Two options are used most (in order of usage and popularity) 1) flake8 – most used by open source python projects 2) pylint – enabled by default in many IDEs like Visual Studio Code Many folks run both. I chose flake8. Primary reason is that out of […]




Install cx_Freeze in Anaconda virtual environment – Windows

cx_Freeze is a tool to create Python executable. Steps: Open Anaconda prompt. Goto Windows-icon. Type “Anaconda Prompt”. Select the suggestion shown. Set the Anaconda virtual environment in the Anaconda prompt. activate ch2_venv “ch2_venv” happens to be my virtual env. You choose yours. then use pip to install like so: pip install cx_Freeze pip install idna […]




Data Analysis of TMDB dataset

Download the dataset from here :https://www.kaggle.com/tmdb/tmdb-movie-metadata Lets take a look at the dataset:




Data Science Pipeline




“The breakpoint will not currently be hit. No symbols have been loaded for this document.” Fix

I got hit by this warning upon Debug-> Attach To Process. No matter what I did the breakpoints would not be hit. Then I figured out the issue. In my case, the problem happened because Visual Studio 2017 was not able to guess the correct version of .NET Framework used in the assembly. It was […]




NLog logger in .NET Project : Tutorial

Recently, I was working on an enterprise project using Windows Forms and needed a logger that was thread-safe, allowed both structured and text based logging and provided an options to integrate email sending as well. Two options came standard NLog or log4Net. Had a brief look at both. log4Net looked like more of XML configuration. […]




Tips for making reusable React components

Tip 1: props.children

Instead of invoking the component with a self-closing tag <Picture /> if you invoke it will full opening and closing tags <Picture> </Picture> you can then place more code between it and display using this.props.children (props.children for stateless components) . This decouples the <Picture> component from its content and makes it more reusable. Tip 2: Stateless Components […]




Generator Functions in Javascript

We will be building on what we discussed in previous post generator-functions-using-co Here we will focus on how to implement something analogous to co. i.e. actually implement an iterable. How to run the function* Steps involved in running through a generator function. If its a bit confusing, it will be clear when we look at the […]