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import argparse

parser = argparse.ArgumentParser()

parser.add_argument("-i", metavar="in-file", type=argparse.FileType("rt"))

parser.add_argument("-o", metavar="out-file", type=argparse.FileType("wt"))

try:

results = parser.parse_args()

print("input file: ", results.i)

print("output file: ", results.o)

except IOError as msg:

parser.error(str(msg))

# python argparse_FileType.py -h

# python argparse_FileType.py -i argparse_FileType.py

# python argparse_FileType.py -i argparse_FileType.py -o /tmp/file.txt

# python argparse_FileType.py -i nosuchfile.txt