python中的命令行参数

import argparse

parser = argparse.ArgumentParser()
parser.add_argument("name", help="the name of the user")
parser.add_argument("age", type=int, help="the age of the user")
args = parser.parse_args()

print("Name:", args.name)
print("Age:", args.age)

$ python script.py John 25
Name: John
Age: 25

import argparse

parser = argparse.ArgumentParser()
parser.add_argument("-v", "--verbose", action="store_true", help="increase output verbosity")
args = parser.parse_args()

if args.verbose:
    print("Verbose mode activated")

$ python script.py -v
Verbose mode activated

$ python script.py --verbose
Verbose mode activated

import argparse

parser = argparse.ArgumentParser()
parser.add_argument("num", type=int, help="an integer")
args = parser.parse_args()

print("Num:", args.num)

$ python script.py 10
Num: 10

import argparse

parser = argparse.ArgumentParser()
parser.add_argument("-l", "--level", type=int, default=1, help="logging level")
args = parser.parse_args()

print("Logging level:", args.level)

$ python script.py -l 2
Logging level: 2

$ python script.py
Logging level: 1