使用文件存储optparse参数

from optparse import OptionParser

parser = OptionParser()
parser.add_option("-f", "--file", dest="filename", help="write report to FILE", metavar="FILE")
parser.add_option("-s", "--size", dest="size", help="specify file size", metavar="SIZE")

(options, args) = parser.parse_args()

if options.filename:
    filename = options.filename
else:
    filename = "default.txt"

if options.size:
    size = options.size
else:
    size = 1024

with open(filename, "w") as f:
    f.write("This is a test file. File size is %s bytes." % size)