traceback – 追溯模块

该模块提供了一个标准接口来打印程序的堆栈跟踪。当您想在程序控制下打印堆栈跟踪时,这很有用。

在这些板上可用
  • ARAMCON Badge 2019
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  • ATMegaZero ESP32-S2
  • Adafruit CLUE nRF52840 Express
  • Adafruit Circuit Playground Bluefruit
  • Adafruit Circuit Playground Express 4-H
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  • Adafruit CircuitPlayground Express with displayio
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  • Adafruit Feather M0 Express
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  • Adafruit Feather M4 CAN
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  • Adafruit LED Glasses Driver nRF52840
  • Adafruit Macropad RP2040
  • Adafruit MagTag
  • Adafruit Matrix Portal M4
  • Adafruit Metro ESP32S2
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  • Adafruit Monster M4SK
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  • Adafruit QT Py M0 Haxpress
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  • AloriumTech Evo M51
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  • CP Sapling M0 w/ SPI Flash
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  • Circuit Playground Express Digi-Key PyCon 2019
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  • CrumpS2
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  • DynOSSAT-EDU-EPS
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  • Espruino Pico
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  • NUCLEO STM32F746
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  • OPENMV-H7 R1
  • Oak Dev Tech BREAD2040
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  • PyCubedv04
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  • Seeeduino Wio Terminal
  • Serpente
  • Silicognition LLC M4-Shim
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  • Teensy 4.0
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  • micro:bit v2
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  • nice!nano
  • stm32f411ce-blackpill
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  • uGame10

traceback.format_exception(etype: Type[BaseException], value: BaseException, tb: types.TracebackType, limit: Optional[int] = None, chain: Optional[bool] = True)None

格式化堆栈跟踪和异常信息。

这些参数与 print_exception() 的相应参数具有相同的含义。返回值是一个字符串列表,每个字符串以换行符结尾,有些包含内部换行符。连接并打印这些行时,将打印与 print_exception() 完全相同的文本。

笔记

chain由于尚未实现链式异常,因此设置将无效。

参数
  • etype (Type[BaseException]) –这被忽略并从 的类型推断出来value.

  • value (BaseException) – 异常。必须是 的实例BaseException.

  • tb (TracebackType) – 回溯对象。如果None,则不会打印回溯。

  • limit (int) – 如果 limit 为正,则打印到 limit 堆栈跟踪条目(从调用者的帧开始)。否则,打印最后的abs(limit) 条目。如果省略限制或无,则打印所有条目。

  • chain (bool) – 如果True然后将打印链式异常(注意:尚未实现)。

traceback.print_exception(etype: Type[BaseException], value: BaseException, tb: types.TracebackType, limit: Optional[int] = None, file: Optional[io.FileIO] = None, chain: Optional[bool] = True)None

打印异常信息和堆栈跟踪条目。

笔记

chain由于尚未实现链式异常,因此设置将无效。

参数
  • etype (Type[BaseException]) – 这被忽略并从 的类型推断出来value.

  • value (BaseException) – 异常。必须是 的实例BaseException.

  • tb (TracebackType) – 回溯对象。如果None,则不会打印回溯。

  • limit (int) – 如果 limit 为正,则打印到 limit 堆栈跟踪条目(从调用者的帧开始)。否则,打印最后的abs(limit)条目。如果省略限制或无,则打印所有条目。

  • file (io.FileIO) – 如果省略 file 或 None, 则输出到 sys.stderr; 否则它应该是一个打开的文件或类似文件的对象来接收输出。

  • chain (bool) – 如果True然后将打印链式异常(注意:尚未实现)。