When a Python project needs a library, the first task is finding a package that fits what the code needs. pip installs Python packages from PyPI or another configured package index. This article shows how to search PyPI by purpose…
Calling `”Python python PYTHON”.replace(“python”, “Ruby”)` changes only the lowercase match. I appreciate the `count` argument because it caps how many matches change. Pass the old and new text to `str.replace()` and check the returned string. Compare that returned string with…
An empty `soup.select(…)` result leaves you with no tags to turn into records, even if the page looks full in a browser. I like that it sends attention back to the actual HTML instead of making the selector a guessing…
Debug prints all repeat the same chore, because the variable name gets typed once as a label and once as the value. The f-string shorthand prints both from a single expression, so the label can never drift out of sync…
Every list of strings eventually needs to become one string, and the line that does it reads backwards. The separator calls the method while the list supplies the items, so a comma-joined row comes out as a one-liner once you…
I ran into a situation last year where I had a pandas DataFrame with 50 columns and needed to pull out specific columns by their numerical position. The column names were generated programmatically and I had no way to know…
I write a lot of small Python utilities that peek at the filesystem, read env vars, or spin up processes. Every time, I reach for the same module first — the os module from the standard library. It has been…
I first ran into namedtuples when debugging a data pipeline. Reading record[0] and record[1] everywhere was a nightmare – switching to record.city and record.state was a instant clarity upgrade that I came back to every time. A namedtuple is a…
I ran into this problem during a data migration when a colleague handed me a CSV full of product codes like “SKU-4829-A” and “ORD-1034-B” — and I needed to pull out just the numbers for validation. Manual extraction was not…
Every ML model, regardless of how it was trained or what framework built it, eventually does the same thing: it takes input and produces output. Python’s model.predict() operation is. It looks simple. It is simple-until it isn’t. The same method…