Debugging: think like a detective

A bug is a mistake in code, debugging is the hunt. Fact: 50% of programming is finding bugs. An error is not failure — it's a clue! "line 5: name is not defined".

• ●Read the error — it gives LINE and TYPE
• ●NameError: typo in variable name
• ●SyntaxError: bracket/colon forgotten
• ●Logic error: runs but wrong → print() everywhere!

Rubber-duck debugging: explain the code out loud — "here I add, here I check…". While explaining you find the bug yourself! Or halve it: comment out half — works? Bug is in the other half.