Home Backend Development Python Tutorial How to use argparse in python

How to use argparse in python

Apr 28, 2023 pm 11:37 PM
python argparse

1. argparse is a python module, used for: interpretation of command line options, parameters and subcommands.

2. Usage steps:

  • Import the argparse module and create an interpreter

  • Add the required parameters

  • Parse parameters

3. Usage example:

import argparse

# 1.创建解释器
parser = argparse.ArgumentParser(description="可写可不写,只是在命令行参数出现错误的时候,随着错误信息打印出来。")
# 2.添加需要的参数
parser.add_argument('-gf', '--girlfriend', choices=['jingjing', 'lihuan'])
# 参数解释
# -gf 代表短选项,在命令行输入-gf和--girlfriend的效果是一样的,作用是简化参数输入
#--girlfriend 代表完整的参数名称,可以尽量做到让人见名知意,需要注意的是如果想通过解析后的参数取出该值,必须使用带--的名称
# choices 代表输入参数的只能是这个choices里面的内容,其他内容则会保错
parser.add_argument('--house', type=int, default=0)
# 参数解释
# --house 代表参数名称
# type  代表输入的参数类型,从命令行输入的参数,默认是字符串类型
# default 代表如果该参数不输入,则会默认使用该值
parser.add_argument('food')
# 参数解释
# 该种方式则要求必须输入该参数
# 输入该参数不需要指定参数名称,指定反而报错,解释器会自动将输入的参数赋值给food

# 3.进行参数解析
args = parser.parse_args() 
print('------args---------',args)
print('-------gf-------', args.girlfriend)
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4. Command line running method
Assume that the name of the above file is When gf.py
is run on the command line, there are the following situations:

  • python gf.py potato, this method will assign potato to food

  • python gf.py -gf jingjing tomato, this method will assign jingjing to girlfriend and tomato to food

  • python gf.py --house 2 chicken, this method will assign the value of house to 2, and the value of food to chicken

The following are specific runtime screenshots of the above three situations:
a.

How to use argparse in python

b.

How to use argparse in python

c.

How to use argparse in python

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