all Python 3tracebackfunction

traceback.print_last()

printing tracebacks

Prints the last uncaught exception of an interactive session (sys.last_exc) — useful in the REPL when the traceback has scrolled away.

Syntax

traceback.print_last(limit=None, file=None, chain=True)

It only works in the interactive interpreter: sys.last_exc (before 3.12 sys.last_type, last_value, last_traceback) is set when an exception reaches the top level of the REPL. In a script you never get there: an uncaught exception ends the program, a caught one is not recorded, and print_last() raises ValueError('no last exception'). For a caught exception use print_exc().

Examples

import traceback
try:
    traceback.print_last()
except ValueError as e:
    print(e)  # → no last exception

See also

Common errors

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