Debugging

Exercise 1

• 100 lines of code
• It's completely new to you, all the lines look the same
• There is one bug inside
• Find the bug in the most efficient way

Exercise 2

• Labyrinth
• You're inside. Get out. All you have is a stacktrace (how you got in).
• Find the bug, the needle in the haystack.

Why is it slow? Strategies for solving performance problems - presented by Caleb Hattingh

• You want to get the call stack!
• When possible, CTRL+C is fast and direct
• If you need more detail, use pytest-profiling
• If it's complicated, use py-spy
• If it's distributed, use a tracing system like Honeycomb