问题描述
我必须编写一个命令行界面，而且我已经看到我可以使用 docopt 和 argparse.
I have to write a command-line interface and I've seen I can use docopt and argparse.
我想知道两者之间的主要区别是什么，以便我做出明智的选择.
I would like to know what are the main differences between the two so that I can make an enlightened choice.
请以事实为依据.我不想要哇.医生.如此美丽.非常有用.
Please stick to the facts. I don't want Wow. docopt. So beautiful. Very useful.
推荐答案
Docopt 解析文档字符串，而 argparse 通过创建对象实例并通过函数调用向其添加行为来构建其解析.
Docopt parses a doc string, whereas argparse constructs its parsing by creating an object instance and adding behaviour to it by function calls.
argparse 示例:
parser = argparse.ArgumentParser()
parser.add_argument("operation", help="mathematical operation that will be performed",
choices=['add', 'subtract', 'multiply', 'divide'])
parser.add_argument("num1", help="the first number", type=int)
parser.add_argument("num2", help="the second number", type=int)
args = parser.parse_args()
docopt 示例:
"""Calculator using docopt
Usage:
calc_docopt.py <operation> <num1> <num2>
calc_docopt.py (-h | --help)
Arguments:
<operation> Math Operation
<num1> First Number
<num2> Second Number
Options:
-h, --help Show this screen.
"""
from docopt import docopt
if __name__ == '__main__':
arguments = docopt(__doc__, version='Calculator with docopt')
print(arguments)
注意，docopt 使用 Usage: 和 Options: 部分进行解析.此处 Arguments: 仅为方便最终用户而提供.
Note, that docopt uses Usage: and Options: sections for parsing. Here Arguments: is provided only for end-user convenience.
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