How to Fix: AttributeError: ‘float’ object has no attribute ‘x’
This is a fundamental AttributeError that means: “You are trying to use a method (like .append() or .lower()) on a simple decimal number (a float).”…
A Guide to Polars Data Types (pl.dtypes)
In Polars, choosing the correct data type (or “dtype”) is the most important step for performance and memory usage. Using a massive Int64 for a…
Polars Data Types: How to cast and Convert Columns
When you load a CSV, Polars (and Pandas) often guesses the data types. Sometimes, it guesses wrong, loading a number column (like 5.0) as a…
How to Fix: AttributeError: ‘int’ object has no attribute ‘x’
This is a fundamental AttributeError that means: “You are trying to use a method (like .append() or .lower()) on a simple number (an integer).” This…
How to Fix: TypeError: unsupported operand type(s) for -: ‘str’ and ‘int’
This TypeError is the cousin of TypeError: unsupported operand type(s) for +. It means: “You tried to use a math operator (like -, *, /)…
How to Fix: TypeError: unsupported operand type(s) for +: ‘int’ and ‘str’
This error is the opposite of the common string concatenation error. It means you tried to do math (+), but one of your items was…
How to Fix: TypeError: can only concatenate str (not “int”) to str
Python is strongly typed. It refuses to guess what you mean if you try to combine different data types, often leading to a TypeError can…
Python Variables & Data Types: A Beginner’s Deep Dive
In Python, understanding Python Variables & Data Types is crucial as everything is an object, and every object has a “type.” Understanding this is the…
