python - argparse 子解析器的帮助中缺少字符

Question

import argparse

parser = argparse.ArgumentParser(formatter_class=argparse.RawTextHelpFormatter)
commands = parser.add_subparsers(title='Available Commands')

cmd1_parser = commands.add_parser('setup1', help="Setup Device 1")
cmd1_parser.add_argument('-f', "--freq", help="Frequency in (Hz)",  metavar='\b', type=int, required=True)
cmd1_parser.add_argument('-p', "--power", help="Power level in (dB)", metavar='\b', type=int, required=True)
cmd1_parser.add_argument('-c', "--current", help="Current (mA)",  metavar='\b', type=int, required=True)

cmd2_parser = commands.add_parser('setup2', help="Setup Device 2")
cmd2_parser.add_argument('-l', "--length", help="Length in meters",  metavar='\b', type=int, required=True)
cmd2_parser.add_argument('-b', "--breadth", help="Breadth in meters", metavar='\b', type=int, required=True)
cmd2_parser.add_argument('-w', "--width", help="Width in meters",  metavar='\b', type=int, required=True)

parser.print_help()
cmd1_parser.print_help()
cmd2_parser.print_help()

此帮助输出的结果:

usage: test2.py [-h] {setup1,setup2} ...

optional arguments:
  -h, --help       show this help message and exit

Available Commands:
  {setup1,setup2}
    setup1         Setup Device 1
    setup2         Setup Device 2
usage: test2.py setup1 [-h] -f -p -c

optional arguments:
  -h, --help         show this help message and exit
  -f, --freq     Frequency in (Hz)
  -, --power    Power level in (dB)
  -c, --current  Current (mA)
usage: test2.py setup2 [-h] -l -b -w

optional arguments:
  -h, --help         show this help message and exit
  -l, --length   Length in meters
  -, --breadth  Breadth in meters
  -w, --width    Width in meters

在 Windows 命令提示符中，“power”和“breadth”分别缺少字符“p”和“b”。然而，使用 PyCharm 获得正确的结果。在 Google 上搜索但找不到任何解决方案。有人可以告诉我如何解决这个问题吗？

Answer 1

更新:

作为你的新要求，查看add_argmument()提供的选项，没有办法做到这一点。我能想到的最合适的是:

cmd1_parser = commands.add_parser('setup1', help="Setup Device 1")
cmd1_parser.add_argument('-f', '--freq', help="Frequency in (Hz)",  metavar='(Hz)',type=int, required=True)
cmd1_parser.add_argument('-p', "--power", help="Power level in (dB)", metavar='(dB)', type=int, required=True)
cmd1_parser.add_argument('-c', "--current", help="Current (mA)", metavar='(mA)', required=True) 

输出是:

optional arguments:
  -h, --help            show this help message and exit
  -f (Hz), --freq (Hz)  Frequency in (Hz)
  -p (dB), --power (dB)
                        Power level in (dB)
  -c (mA), --current (mA)
                        Current (mA)

====================

旧答案:

只需将 metavar='\b' 替换为 metavar='' 即可。 '\b' 是一个退格键，在打印选项字符串后，python 将“打印”元变量(该参数的一种名称)，因此它将调用退格键并删除您的字符。

这是使用上述操作后的输出:

>>> parser.print_help()
usage: [-h] {setup1,setup2} ...

optional arguments:
  -h, --help       show this help message and exit

Available Commands:
  {setup1,setup2}
    setup1         Setup Device 1
    setup2         Setup Device 2
>>> cmd1_parser.print_help()
usage:  setup1 [-h] -f  -p  -c

optional arguments:
  -h, --help       show this help message and exit
  -f , --freq      Frequency in (Hz)
  -p , --power     Power level in (dB)
  -c , --current   Current (mA)
>>> cmd2_parser.print_help()
usage:  setup2 [-h] -l  -b  -w

optional arguments:
  -h, --help       show this help message and exit
  -l , --length    Length in meters
  -b , --breadth   Breadth in meters
  -w , --width     Width in meters