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比方說,用戶運行該腳本W/O提供任何paramters。我怎樣才能使它默認爲./myscript.py -h
,這樣它就可以顯示幫助信息?使Python顯示幫助頁面,如果不採取行動給出
parser = optparse.OptionParser()
parser.add_option("-d", "--directory", metavar="DIR",
help="Directory to scan for big files")
parser.add_option("-e", "--email", metavar='EMAIL',
help='email to send the list to')
parser.add_option("-l", "--limit", metavar='LIMIT',
help='return number of files')