class_docstr: Abstract base class for defining command classes, the "worker bees"
  of the Distutils.  A useful analogy for command classes is to think of
  them as subroutines with local variables called "options".  The options
  are "declared" in 'initialize_options()' and "defined" (given their
  final values, aka "finalized") in 'finalize_options()', both of which
  must be defined by every command class.  The distinction between the
  two is necessary because option values might come from the outside
  world (command line, config file, ...), and any options dependent on
  other options must be computed *after* these outside influences have
  been processed -- hence 'finalize_options()'.  The "body" of the
  subroutine, where it does all its work based on the values of its
  options, is the 'run()' method, which must also be implemented by every
  command class.
docstr: Set the values of any "undefined" options from corresponding
  option values in some other command object.  "Undefined" here means
  "is None", which is the convention used to indicate that an option
  has not been changed between 'initialize_options()' and
  'finalize_options()'.  Usually called from 'finalize_options()' for
  options that depend on some other command rather than another
  option of the same command.  'src_cmd' is the other command from
  which option values will be taken (a command object will be created
  for it if necessary); the remaining arguments are
  '(src_option,dst_option)' tuples which mean "take the value of
  'src_option' in the 'src_cmd' command object, and copy it to
  'dst_option' in the current command object".
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code: def set_undefined_options(self, src_cmd, *option_pairs):
      """Set the values of any "undefined" options from corresponding
      option values in some other command object.  "Undefined" here means
      "is None", which is the convention used to indicate that an option
      has not been changed between 'initialize_options()' and
      'finalize_options()'.  Usually called from 'finalize_options()' for
      options that depend on some other command rather than another
      option of the same command.  'src_cmd' is the other command from
      which option values will be taken (a command object will be created
      for it if necessary); the remaining arguments are
      '(src_option,dst_option)' tuples which mean "take the value of
      'src_option' in the 'src_cmd' command object, and copy it to
      'dst_option' in the current command object".
      """
      # Option_pairs: list of (src_option, dst_option) tuples
      src_cmd_obj = self.distribution.get_command_obj(src_cmd)
      src_cmd_obj.ensure_finalized()
      for src_option, dst_option in option_pairs:
          if getattr(self, dst_option) is None:
              setattr(
                  self, dst_option, getattr(src_cmd_obj, src_option)
              )
  
imports: import sys
  import os
  import re
  import logging
  from .errors import DistutilsOptionError
  from .None import util, dir_util, file_util, archive_util, _modified
  from ._log import log
label_desc: Use image node_id 17 for calling the Command obj's underlying member method code with example usage: obj.set_undefined_options(src_cmd) without return types