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import sys
try:
raise Exception('foobar')
except:
info = sys.exc_info()
print(type(e[2])) # <class 'traceback'>
help(traceback) # NameError: name 'traceback' is not defined
What exactly is the type of the traceback objects that Python uses for exception reporting?
The docs on sys.exc_info mention the Reference Manual, but while I've found plenty of information on how to manipulate traceback instances, I want to be able to access the type (class) itself.
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Last Updated : 01 Aug, 2020 Traceback is a python module that provides a standard interface to extract, format and print stack traces of a python program. When it prints the stack trace it exactly mimics the behaviour of a python interpreter. Useful when you want to print the stack trace at any step.
This module provides a standard interface to extract, format and print stack traces of Python programs. It exactly mimics the behavior of the Python interpreter when it prints a stack trace. This is useful when you want to print stack traces under program control, such as in a “wrapper” around the interpreter.
The module uses traceback objects — this is the object type that is stored in the sys.last_traceback variable and returned as the third item from sys.exc_info (). The module defines the following functions: Print up to limit stack trace entries from traceback object tb (starting from the caller’s frame) if limit is positive.
The module uses traceback objects, this is the object type that is stored in the sys.last_traceback variable and returned as the third item from sys.exc_info (). traceback. print_tb (tb, limit = None, file = None) : If limit is positive it prints upto limit stack trace entries from traceback object tb. Otherwise, print the last abs (limit) entries.
traceback object is an instance of TracebackType present under types module.
types.TracebackTypeThe type of
tracebackobjects such as found insys.exc_info()[2].
>>> from types import TracebackType
>>> isinstance(info[2], TracebackType)
True
>>> TracebackType
<class 'traceback'>
As pointed out by @user2357112 the name TracebackType is basically an alias to the internal traceback type and is set by raising an exception in types module. The actual traceback type can be found in CPython code.
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