class_docstr: Mark the magic as having argparse arguments and possibly adjust the
  name.
code: def __call__(self, func):
      if not getattr(func, "has_arguments", False):
          func.has_arguments = True
          func.decorators = []
      if self.name is not None:
          func.argcmd_name = self.name
      # This should be the first decorator in the list of decorators, thus the
      # last to execute. Build the parser.
      func.parser = construct_parser(func)
      return func
  
imports: import argparse
  import re
  from IPython.core.error import UsageError
  from IPython.utils.decorators import undoc
  from IPython.utils.process import arg_split
  from IPython.utils.text import dedent
label_desc: Use image node_id 2 for calling the magic_arguments obj's underlying member method code with example usage: obj.__call__(func) and returns: func