How to Fix “TypeError: 'int' object is not callable” From Shadowed Names in Python Games

Calling something that used to be a function but now holds a number produces this. The overwrite happened earlier and elsewhere — the call site is innocent. Here is the hunt.

How to fix it

1. Trace the overwrite

Search for assignments to the name: len = array_length-style helpers, sum = sum(scores), or a loop variable reusing a function name — the last assignment before the call is the bug.

2. Stop borrowing built-in names

list, dict, str, sum, len, max, min, type, input as variable names all set this trap — rename to items, total, text, and the class of bugs disappears.

3. Keep methods and attributes distinct

A class with self.update = 0 and def update(self): silently replaces the method on that instance — name the counter update_count.

4. Let the linter catch it

Enable a linter (ruff/pylint) — shadowing built-ins is a standard warning, flagged as you type instead of as a runtime crash.

Catching the ones you can't reproduce

The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.

Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.

This is where a tool like Bugnet earns its place. Its SDK captures every Pygame error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.