input_fail.py


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#!/usr/bin/env python

# Exit with 1 if any input is provided. Print the input to stdout, unless an
# argument is specified. In that case, print the argument.

import sys

input_string = sys.stdin.read()
if input_string != "":
    if len(sys.argv) >= 2:
        print(sys.argv[1])
    else:
        sys.stdout.write(input_string)
    sys.exit(1)