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# Debugging and Profiling

These libraries help you with Python development: the debugger enables you to step through code, analyze stack frames and set breakpoints etc., and the profilers run code and give you a detailed breakdown of execution times, allowing you to identify bottlenecks in your programs.

- `bdb` — Debugger framework
- `pdb` — The Python Debugger
- Debugger Commands
- The Python Profilers
  - Introduction to the profilers
  - Instant User’s Manual
  - What Is Deterministic Profiling?
  - Reference Manual – `profile` and `cProfile`
    - The `Stats` Class
  - Limitations
  - Calibration
  - Extensions — Deriving Better Profilers
- `timeit` — Measure execution time of small code snippets
  - Command Line Interface
  - Examples
- `trace` — Trace or track Python statement execution
  - Command Line Usage
  - Programming Interface

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