from argparse import ArgumentParser

def indent_type(n):
	n = int(n)
	if n: return " " * n
	else: return "\t"

for argv in [[],"--indent 4".split()]:
	for default in ["\t", 0]:
		try:
			parser = ArgumentParser()
			parser.add_argument("--indent", default=default, type=indent_type)
			args = parser.parse_args(argv)
			if type(args.indent) != str:
				raise Exception("tried to-be-converted default; wasn’t converted")
			print(" win:", repr(default), argv)
		except Exception as e:
			print("fail:", repr(default), argv, type(e).__name__, e)