A great visual reference of the Top 20 Python Exceptions—but if you want to debug production systems like a senior engineer, watch out for three critical nuances hidden in this chart:

1. The "try-except" Trap (Error #1, #2, and #3): The Quick Tip at the bottom says to use tch these errors. However, SyntaxError, IndentationError, and TabError happen during the parsing stage before execution begins. You cannot catch a syntax error inside the same file using a standard try-except block!

2. TypeError (#5) vs ValueError (#6): The classic interview question. Calling int([1, 2]) raises a TypeError because a list is the wrong data type, whereas calling int("abc") raises a ValueError because a string is an accepted type, but "abc" is an invalid base-10 value.

3. StopIteration (#19) Is Normal Control Flow: Unlike the other 19 errors, StopIteration is how every Python "for" loop secretly works under the hood to know when an iterator is exhausted.

Out of all 20 exceptions on this list, which one shows up in your logs the most—#8 KeyError, #9 AttributeError, or #20 UnicodeDecodeError? Drop your #1 culprit below!

Oct 26, 2026 · 5:31 AM UTC

3
22
111
6,107
Replying to @PythonDvz
Bonus Python quiz on Error #15 (OverflowError): In Python 3, standard integers have arbitrary precision and never overflow (you can easily calculate 10**10000).

So what exact operation in Python still triggers an OverflowError today?
0
1
1
378
RepliesRelevant