code: def push(
      self, service_name, user=None, password=None, using_docker=False
  ):
      def _push(service):
          if using_docker:
              return self._execute_docker("push", service["image"])
          else:
              return self._execute_compose("push", service["name"])
  
      if user is not None:
          try:
              # TODO(kszucs): have an option for a prompt
              self._execute_docker("login", "-u", user, "-p", password)
          except subprocess.CalledProcessError:
              # hide credentials
              msg = "Failed to push `{}`, check the passed credentials".format(
                  service_name
              )
              raise RuntimeError(msg) from None
  
      service = self.config.get(service_name)
      for ancestor in service["ancestors"]:
          _push(self.config.get(ancestor))
      _push(service)
  
imports: import os
  import shlex
  import subprocess
  from io import StringIO
  from dotenv import dotenv_values
  from ruamel.yaml import YAML
  from ..utils.command import Command, default_bin
  from ..utils.source import arrow_path
  from ..compat import _ensure_path
label_desc: Use image node_id 8 for calling the DockerCompose obj's underlying member method code with example usage: obj.push(service_name, user, password, using_docker) and returns: self, self