调试和分析
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这些库可以帮助你进行Python开发：调试器使你能够逐步执行代码，分析堆栈帧
并设置断点等，而分析器运行代码并为你提供执行时间的详细分类，从而使你能
够找出你程序中的瓶颈。

* "bdb" --- Debugger framework

* "faulthandler" --- Dump the Python traceback

  * Dumping the traceback

  * Fault handler state

  * Dumping the tracebacks after a timeout

  * Dumping the traceback on a user signal

  * Issue with file descriptors

  * 示例

* "pdb" --- Python的调试器

  * Debugger Commands

* The Python Profilers

  * Introduction to the profilers

  * Instant User's Manual

  * "profile" and "cProfile" Module Reference

  * The "Stats" Class

  * What Is Deterministic Profiling?

  * Limitations

  * Calibration

  * Using a custom timer

* "timeit" --- 测量小代码片段的执行时间

  * 基本示例

  * Python 接口

  * 命令行界面

  * 示例

* "trace" --- Trace or track Python statement execution

  * Command-Line Usage

    * Main options

    * Modifiers

    * Filters

  * Programmatic Interface

* "tracemalloc" --- Trace memory allocations

  * 示例

    * Display the top 10

    * Compute differences

    * Get the traceback of a memory block

    * Pretty top

  * API

    * 函数

    * DomainFilter

    * Filter

    * Frame

    * Snapshot

    * Statistic

    * StatisticDiff

    * Trace

    * Traceback
