Python 3.2+Exceptionsexception

argparse.ArgumentTypeError

module exceptions

An error from trying to convert a command line string to a type

Syntax

raise argparse.ArgumentTypeError

Raise it from your own type= callable so argparse prints your wording as an ordinary parse error and exits with code 2 instead of dumping a traceback. ValueError and TypeError from a type callable are caught as well, but argparse replaces your text with the generic "invalid ... value" message; anything else propagates and crashes the program.

Examples

import argparse
try:
    raise argparse.ArgumentTypeError
except argparse.ArgumentTypeError as e:
    print(type(e).__name__)   # → ArgumentTypeError

See also

Open in the full glossarydocs.python.orgReport an inaccuracy