示例代码:
import argparse
import cmd2
import sys
def create_subparser(a_parser = None):
if a_parser is None:
new_parser = argparse.ArgumentParser()
else:
new_parser = a_parser.add_parser("single")
new_parser.add_argument("--single-param", "-sp")
return new_parser
def single_print(some_param):
print("single operation " + str(some_param))
def other_print():
print("other operation")
class TestCmd(cmd2.Cmd):
single_parser = create_subparser()
@cmd2.with_argparser(single_parser)
def do_single(self, opts):
print(opts)
single_print(opts.single_param)
def do_other(self, opts):
other_print()
if __name__ == "__main__":
parser = argparse.ArgumentParser()
subparsers = parser.add_subparsers(help="commands", dest="mode")
create_subparser(subparsers)
cmd_parser = subparsers.add_parser("cmd", help="shell")
args = parser.parse_args()
if args.mode == "single":
single_print(args.single_param)
else:
sys.argv = [sys.argv[0]] # cmd2 complains about unknown parameters without
cmd = TestCmd()
cmd.cmdloop()
在示例中,我正在尝试制作一个可以在单模式program.py single -sp test
(我尝试获取 cmd2 类中 do_single 中使用的 argparse 的所有值,我得到了。使用 cmd2 的调试,它会:program.py cmd
single -sp test
other
EXCEPTION of type 'RecursionError' occurred with message: 'maximum recursion depth exceeded in comparison'
Traceback (most recent call last):
File "/home/.../site-packages/cmd2/cmd2.py", line 2011, in onecmd_plus_hooks
stop = self.onecmd(statement, add_to_history=add_to_history)
File "/home/.../site-packages/cmd2/cmd2.py", line 2441, in onecmd
stop = func(statement)
File "/home/.../site-packages/cmd2/decorators.py", line 308, in cmd_wrapper
return func(*args_list, **kwargs)
File "test.py", line 28, in do_single
print(opts)
File "/usr/lib/python3.7/argparse.py", line 131, in __repr__
arg_strings.append('%s=%r' % (name, value))
File "/usr/lib/python3.7/argparse.py", line 131, in __repr__
arg_strings.append('%s=%r' % (name, value))
File "/usr/lib/python3.7/argparse.py", line 131, in __repr__
arg_strings.append('%s=%r' % (name, value))
[Previous line repeated 326 more times]
File "/usr/lib/python3.7/argparse.py", line 129, in __repr__
for name, value in self._get_kwargs():
File "/usr/lib/python3.7/argparse.py", line 139, in _get_kwargs
return sorted(self.__dict__.items())
RecursionError: maximum recursion depth exceeded in comparison
我使用该create_subparser
函数的原因是因为我正在创建要由 cmd2.Cmd 子类使用的子解析器,但是我想在从主 shell 调用时对模式使用相同的解析器。这基本上是一个最小的工作示例,我的代码有更多的标志等等。
另一件事,问题似乎是因为print(opts)
. 似乎它试图这样做vars(opts)
,当它尝试枚举所有变量时,由于某处递归而耗尽内存。如果我不尝试列出对象内的所有变量(例如,如果我只使用opts.single_param
),它会起作用。这似乎与我试图在 cmd2 和主程序中使用相同的 argparser 有关,但我不明白为什么会发生这种情况以及是否可以修复。