traceback – Traceback Module

This module provides a standard interface to print stack traces of programs. This is useful when you want to print stack traces under program control.

This module implements a subset of the corresponding CPython module, as described below. For more information, refer to the original CPython documentation: traceback.

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

Format a stack trace and the exception information.

The arguments have the same meaning as the corresponding arguments to print_exception(). The return value is a list of strings, each ending in a newline and some containing internal newlines. When these lines are concatenated and printed, exactly the same text is printed as does print_exception().

Note

Setting chain will have no effect as chained exceptions are not yet implemented.

Parameters

  • etype (Type[BaseException]) – This is ignored and inferred from the type of value.

  • value (BaseException) – The exception. Must be an instance of BaseException.

  • tb (TracebackType) – The traceback object. If None, the traceback will not be printed.

  • limit (int) – Print up to limit stack trace entries (starting from the caller’s frame) if limit is positive. Otherwise, print the last abs(limit) entries. If limit is omitted or None, all entries are printed.

  • chain (bool) – If True then chained exceptions will be printed (note: not yet implemented).

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

Prints exception information and stack trace entries.

Note

Setting chain will have no effect as chained exceptions are not yet implemented.

Parameters

  • etype (Type[BaseException]) – This is ignored and inferred from the type of value.

  • value (BaseException) – The exception. Must be an instance of BaseException.

  • tb (TracebackType) – The traceback object. If None, the traceback will not be printed.

  • limit (int) – Print up to limit stack trace entries (starting from the caller’s frame) if limit is positive. Otherwise, print the last abs(limit) entries. If limit is omitted or None, all entries are printed.

  • file (io.FileIO) – If file is omitted or None, the output goes to sys.stderr; otherwise it should be an open file or file-like object to receive the output.

  • chain (bool) – If True then chained exceptions will be printed (note: not yet implemented).