all Python 3inspectfunction

inspect.istraceback()

stack and frames

Checks that an object is a traceback (types.TracebackType), such as e.__traceback__ or sys.exc_info()[2].

Syntax

inspect.istraceback(object) -> bool

An exception is not a traceback: istraceback(e) is False, you need e.__traceback__. A traceback is a linked list: tb.tb_next leads to the next frame closer to the error, tb.tb_frame to the frame itself. An exception that was created but never raised has __traceback__ set to None, and the check filters that case out too.

Examples

import inspect
try:
    1 / 0
except ZeroDivisionError as e:
    err = e
print(inspect.istraceback(err), inspect.istraceback(err.__traceback__))  # → False True
print(inspect.istraceback(ValueError('x').__traceback__))  # → False — не возбуждалось

See also

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