python - argparse 添加示例用法

Question

我使用 argparse 来处理输入参数，它使用 parser.print_help() 输出以下内容:

optional arguments:
  -h, --help            show this help message and exit
  -t TEMPLATES, --templates TEMPLATES
                    template names to make, should be defined as section
                    name in conf, and have related file in templates/
                    folder
  -c CONFPATH, --confpath CONFPATH
                    configuration path for template detail info

我的代码如下所示:

    import argparse
    parser = argparse.ArgumentParser(prog='base_maker', description='template maker')
    parser.add_argument('-t', '--templates', help='template names to make, should be defined as section name in conf, and have related file in templates/ folder', type=str)
    parser.add_argument('-c', '--confpath', help='configuration path for template detail info', type=str, default=os.path.join(basepath, 'conf/maker.conf'))

但是，我想添加一个关于如何使用-t/--template 的详细示例，例如(添加在示例 部分):

optional arguments:
  -h, --help            show this help message and exit
  -t TEMPLATES, --templates TEMPLATES
                    template names to make, should be defined as section
                    name in conf, and have related file in templates/
                    folder
  -c CONFPATH, --confpath CONFPATH
                    configuration path for template detail info

 example:

     python test.py -t template/test.py
     python test.py -t template/test -c conf/test.conf
     python test.py -t test.py

我不知道应该使用哪个属性来添加“示例”部分，我检查了Print program usage example with argparse modulen , 但当我检查 epilog in the official doc 时，不清楚并且没有详细的例子.

任何人都可以给我一个关于如何实现这一目标的例子吗？谢谢

Answer 1

如果您希望帮助示例打印在末尾(结尾)并保留空白/格式(formatter_class 设置为 RawDescriptionHelpFormatter)，则需要使用 ArgumentParser 的结尾和 formatter_class 参数。

修改上面的示例的示例:

import argparse

example_text = '''example:

 python test.py -t template/test.py
 python test.py -t template/test -c conf/test.conf
 python test.py -t test.py'''

parser = argparse.ArgumentParser(prog='base_maker',
                                 description='template maker',
                                 epilog=example_text,
                                 formatter_class=argparse.RawDescriptionHelpFormatter)

parser.add_argument('-t', '--templates', help='template names to make, should be defined as section name in conf, and have related file in templates/ folder', type=str)
parser.add_argument('-c', '--confpath', help='configuration path for template detail info', type=str, default=os.path.join(basepath, 'conf/maker.conf'))