Basic use of argparse library in Python (example)

What this article brings to you is about the basic use (examples) of the argparse library in Python. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Basic use

import argparse

# 创建解析器
parser = argparse.ArgumentParser(description = 'This is a test')
parser.parse_args()

Can be tested in the shell:

$ python test.py --help
...

Add parameters

import argparse

parser = argparse.ArgumentParser(description = 'This is a test')
parser.add_argument("-p","--port",help='increase output port') # 定义了可选参数-p和--port，赋值后，其值保存在args.port中(其值都是保存在最后一个定义的参数中)
args = parser.parse_args()
print(args.echo)

When used:

$ python test.py -p 50
或
$ python test.py --port 50

Specify type

We can also specify the type when adding parameters.

import argparse

parser = argparse.ArgumentParser(description = 'This is a test')
parser.add_argument("square",help="display a given number",type=int) # 指定给square的参数为int类型

Optional parameters

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

Use:

$ python test.py -v any

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