Python Argparse 库的使用


Author: yifei / Created: April 4, 2018, 2:23 p.m. / Modified: April 4, 2018, 10:53 p.m. / Edit

基本用法

import argparse
parser = argparse.ArgumentParser()
parser.add_argument("--verbosity", help="increase output verbosity")
args = parser.parse_args()
print(args.verbosity)

两种不同的参数模式, positionaloptional arguments,感觉之间的区别有点像 args 和 kwargs

subcommand

Actually, the argparse module is not ok with subcommand, mannually parse the first command and then pass the rest to argparse

add_argument 的参数

name or flags - Either a name or a list of option strings, e.g. foo or `-f`, `--foo`.
action - The basic type of action to be taken when this argument is encountered at the command line. store/store_const/store_true/append/count
nargs - The number of command-line arguments that should be consumed. N/?/*/+
const - A constant value required by some action and nargs selections.
default - The value produced if the argument is absent from the command line.
type -  The type to which the command-line argument should be converted.
choices - A container of the allowable values for the argument. a list 
required - Whether or not the command-line option may be omitted (optionals only).
help - A brief description of what the argument does.
metavar - A name for the argument in usage messages.
dest - The name of the attribute to be added to the object returned by parse_args().

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