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)
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.
b.
c.
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