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As a Python developer, I was working on a data-cleaning project where I had to process large CSV files exported from a U.S. retail system. The issue was that many of the text fields came wrapped in single or double quotes. At first, I thought Python would have a built-in way to strip quotes from … Read more >>
Recently, I was working on a data-cleaning project where I had to process customer feedback collected from different regions of the USA. The challenge? Many of the text files contained special Unicode characters like emojis, accented letters, and symbols that I didn’t need in my analysis. I quickly realized that removing Unicode characters in Python … Read more >>
When I was working on a Python script that needed to take input from the command line, display results to the user, and log errors separately. The issue was… I realized many beginners (and even some experienced developers) are not fully aware of how stdin, stdout, and stderr work in Python. So, in this tutorial, … Read more >>
NameError: name ‘x’ is not defined means Python reached a name it has no value for. Four causes account for almost every case: Since Python 3.10 the error often names the fix itself, which is the fastest place to start. Every traceback below is a real failing script on Python 3.12.5. The Python NameError “Did … Read more >>
As a developer, I was working on a project where I had to validate text input from users against a stored reference string. The tricky part? I needed to check the strings character by character, not just whether they were equal overall. Over the years, I’ve used multiple approaches to solve this kind of problem … Read more >>
Recently, I was working on a project where I had to clean up some messy financial data. The data came from different U.S. retail systems, and many of the values had decimals attached to them inside strings. For example, I had strings like “Product123.45” or “Invoice-567.89”. What I really needed was just the integer part … Read more >>
I was working on a financial reporting project for a client in the USA, and I ran into a common formatting issue. The numbers in my report appeared to be 45.6000 or 120.000. At first glance, this might not seem like a big deal. But when you’re preparing reports for stakeholders, clean and precise formatting … Read more >>
When I started working with financial data in Python, I often needed to remove decimal numbers from values. For example, when processing sales reports from different states in the USA, I had to clean up amounts like 1234.56 into 1234. At first, I thought there was just one way to do it. But with more … Read more >>
Python has no increment or decrement operators. There is no ++ and no –. You use augmented assignment instead: The dangerous part is that ++count does not raise an error. It’s valid Python that does absolutely nothing, so the bug is silent. Every result on this page comes from running the code on Python 3.12.5. … Read more >>
While reviewing a client’s automation script, I ran into an error that read: At first glance, it looked confusing because the code seemed fine. However, after digging deeper, I realized the issue was caused by hidden or invalid characters in the script. If you’ve been coding in Python long enough, you’ll likely face this error … Read more >>
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