我正在尝试在我的Python应用程序中使用argparse模块。
我的应用程序应该使用单个必需参数运行,不带任何前缀。但我无法想出如何实现。
import argparse
parser = argparse.ArgumentParser(description='process an integer')
parser.add_argument('integer', metavar='N', type=int, nargs=1,
help='an integer')
args = parser.parse_args()
print(args.integer)
$ python argparse1.py 5
[5]
$ python argparse1.py
usage: argparse1.py [-h] N
argpars1.py: error: the following arguments are required: N
$ python argparse1.py 5 7
usage: argparse1.py [-h] N
argparse1.py: error: unrecognized arguments: 7
$ python argparse1.py test
usage: argparse1.py N
argparse1.py: error: argument N: invalid int value: 'test'
$ python argparse1.py -h
usage: argparse1.py [-h] N
process an integer
positional arguments:
N an integer
optional arguments:
-h, --help show this help message and exit
import argparse
parser = argparse.ArgumentParser(add_help=False)
parser.add_argument('integer', metavar='N', type=int, nargs=1)
args = parser.parse_args()
print(args.integer)
$ python argparse2.py
usage: argparse2.py N
argparse2.py: error: the following arguments are required: N
$ python argparse2.py 5
[5]
$ python argparse2.py 5 7
usage: argparse2.py N
argparse2.py: error: unrecognized arguments: 7
$ python argparse2.py hello
usage: argparse2.py N
argparse2.py: error: argument N: invalid int value: 'hello'
$ python argparse2.py -h
usage: argparse2.py N
argparse2.py: error: the following arguments are required: N
from argparse import ArgumentParser,SUPPRESS
parser = ArgumentParser(add_help=False, usage=SUPPRESS)
parser.add_argument('integer', metavar='N', type=int, nargs=1)
args = parser.parse_args()
print(args.integer)
$ python argparse3.py 5
[5]
$ python argparse3.py 5 7 9
argparse3.py: error: unrecognized arguments: 7 9
$ python argparse3.py -h
argparse3.py: error: the following arguments are required: N
import os
import sys
from argparse import ArgumentParser,SUPPRESS
script = os.path.basename(sys.argv[0])
usage = 'usage: ' + script + ' n (int)'
parser = ArgumentParser(add_help=False, usage=SUPPRESS)
parser.add_argument('integer', nargs='*')
args = parser.parse_args()
if (len(args.integer) == 0):
print('error: no argument provided\n', usage, file=sys.stderr, sep = '')
sys.exit(1)
if (len(args.integer) > 1):
print('error: too many arguments\n', usage, file=sys.stderr, sep = '')
sys.exit(1)
v = args.integer[0]
try:
v = int(v)
except ValueError:
print("error: '", v, "'", ' is not an integer\n', usage, file=sys.stderr, sep='')
sys.exit(1)
print(v + 2)
$ python argparse4.py 5
7
$ python argparse4.py
error: no argument provided
usage: argparse4.py n (int)
$ python argparse4.py 5 9
error: too many arguments
usage: argparse4.py n (int)
$ python argparse4.py hello
error: 'hello' is not an integer
usage: argparse4.py n (int)
你只需要像这样定义参数:
parser.add_argument("x")
不要在 x
前面添加任何 -
。
python myscript.py argument
这样的命令。在我看来,添加一个单一位置参数应该可以实现你想要的功能。 - Amy Teegarden