how to use argument parser in python code example

Example 1: python parse args

# parsing arguments with argparse is too easy
import argparse

parser = argparse.ArgumentParser(description='Process some integers.')
parser.add_argument('integers', metavar='N', type=int, nargs='+',
                    help='an integer for the accumulator')
parser.add_argument('--sum', dest='accumulate', action='store_const',
                    const=sum, default=max,
                    help='sum the integers (default: find the max)')

args = parser.parse_args()
print(args.accumulate(args.integers))

Example 2: python argparse file argument

import argparse

parser = argparse.ArgumentParser()
parser.add_argument('file', type=argparse.FileType('r'))
args = parser.parse_args()

print(args.file.readlines())

Example 3: python argument parser default value

parser.add_argument("-v", "--verbose", action="store_true",
                    default="your default value", help="verbose output")

Example 4: parser = argparse.ArgumentParser()

import argparse
parser = argparse.ArgumentParser()
parser.parse_args()

Example 5: run function from argument parser

FUNCTION_MAP = {'top20' : my_top20_func,
                'listapps' : my_listapps_func }

parser.add_argument('command', choices=FUNCTION_MAP.keys())

args = parser.parse_args()

func = FUNCTION_MAP[args.command]
func()