python command line flags code example

Example 1: python commands

simple python commands

print("your text here")

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name = input("what is your name")
print("nice to meet you " + name)

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A = int(input("give me the first num "))
B = int(input("give me the second num "))
f = A + B
print(f)

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 argparser flags

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

Example 4: run python with options

import argparse
import sys

parser = argparse.ArgumentParser(description="Does some awesome things.")
parser.add_argument('message', type=str, help="pass a message into the script")

if __name__ == '__main__':
    args = parser.parse_args(sys.argv[1:])
    print args.message

Example 5: ArgumentParser(parent)

>>> parent_parser = argparse.ArgumentParser(add_help=False)
>>> parent_parser.add_argument('--parent', type=int)

>>> foo_parser = argparse.ArgumentParser(parents=[parent_parser])
>>> foo_parser.add_argument('foo')
>>> foo_parser.parse_args(['--parent', '2', 'XXX'])
Namespace(foo='XXX', parent=2)

>>> bar_parser = argparse.ArgumentParser(parents=[parent_parser])
>>> bar_parser.add_argument('--bar')
>>> bar_parser.parse_args(['--bar', 'YYY'])
Namespace(bar='YYY', parent=None)