How to Fix: TypeError: Object of type … is not JSON serializable
If you’ve ever seen a TypeError JSON serializable message, so you only know that The JSON format is very strict and only understands: If you…
Working with Dates in Polars: The .dt Namespace (2026 Guide)
Just loading dates isn’t enough. For real analysis, you need to “engineer features” from them, like “What day of the week do most sales happen?”…
Working with Dates and Times in Python (datetime module)
If you’re not using Pandas, Python’s built-in datetime module is the standard way to handle dates and times. The Python datetime module offers essential functionality…
Working with Dates and Times in Pandas (DatetimeIndex)
If you load a CSV with dates, Pandas usually reads them as simple strings (objects). To do real analysis like “Calculate monthly average sales“, you…
