Python学习笔记|Python之Argparse

基本用法

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

结果为：

$ python prog.py --help
usage: prog.py [-h]

optional arguments:
  -h, --help  show this help message and exit

位置参数

用法1

import argparse
parser = argparse.ArgumentParser()
parser.add_argument("echo")
args = parser.parse_args()
print args.echo

结果

$ python prog.py --help
usage: prog.py [-h] echo

positional arguments:
  echo

optional arguments:
  -h, --help  show this help message and exit

用法2

import argparse
parser = argparse.ArgumentParser()
parser.add_argument("echo", help="echo the string you use here")
args = parser.parse_args()
print args.echo

结果为：

$ python prog.py -h
usage: prog.py [-h] echo

positional arguments:
  echo        echo the string you use here

optional arguments:
  -h, --help  show this help message and exit

用法3

parser = argparse.ArgumentParser()
parser.add_argument("square", help="display a square of a given number",
                    type=int)
args = parser.parse_args()
print args.square**2

结果为：

$ python prog.py 4
16

可选参数

用法1

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

结果为：

$ python prog.py --help
usage: prog.py [-h] [--verbosity VERBOSITY]

optional arguments:
  -h, --help            show this help message and exit
  --verbosity VERBOSITY
                        increase output verbosity

用法2

import argparse
parser = argparse.ArgumentParser()
parser.add_argument("-v", "--verbose", help="increase output verbosity",
                    action="store_true")
args = parser.parse_args()
if args.verbose:
    print "verbosity turned on"

结果为：

$ python prog.py -v
verbosity turned on
$ python prog.py --help
usage: prog.py [-h] [-v]

optional arguments:
  -h, --help     show this help message and exit
  -v, --verbose  increase output verbosity

组合参数

位置参数及可选参数组合

import argparse
parser = argparse.ArgumentParser()
parser.add_argument("square", type=int,
                    help="display a square of a given number")
parser.add_argument("-v", "--verbose", action="store_true",
                    help="increase output verbosity")
args = parser.parse_args()
answer = args.square**2
if args.verbose:
    print "the square of {} equals {}".format(args.square, answer)
else:
    print answer

结果为：

$ python prog.py 4
16
$ python prog.py 4 --verbose
the square of 4 equals 16
$ python prog.py --verbose 4
the square of 4 equals 16

参数解析

type=int

如果type=int,则args.verbosity为整数

parser.add_argument("-v", "--verbosity", type=int,
                    help="increase output verbosity")
args = parser.parse_args()

action = “store_true”

如果action=“store_true”，则args.verbosity为True，False

choices=[0, 1, 2]

如果choices

parser.add_argument("-v", "--verbosity", type=int, choices=[0, 1, 2],
                    help="increase output verbosity")

action=‘count’

如果为action=‘count’,则表示为-v参数的个数

parser.add_argument("-v", "--verbosity", action="count",
                    help="increase output verbosity")

来源：CSDN

作者：Tester_hope

链接：https://blog.csdn.net/Hh20161314/article/details/104649793

标签

python

argparse

echo