docs: def _inspect_and_map(self, identifier):
          """
          example response:
              {
                  u'comment': u'',
                  u'virtual_size': 566087127,
                  u'container': u'a2ea130e8c7a945823c804253c20f7c877376c69a36311a0cc614d5c455f645f',
                  u'os': u'linux',
                  u'parent': u'14e75a5684c2fabb7db24d92bdda09d11da1179a7d86ab4c9640ef70d1fd4082',
                  u'author': u'alexb@tune.com',
                  u'checksum': u'tarsum.dev+sha256:1b755912c77197c6a43539f2a708ef89d5849b8ce02642cb702e47afaa8195c3',
                  u'created': u'2014-10-16T23:41:25.445801849Z',
                  u'container_config': {
                      u'tty': False,
                      u'on_build': [],
                      u'domainname': u'',
                      u'attach_stdin': False,
                      u'image': u'14e75a5684c2fabb7db24d92bdda09d11da1179a7d86ab4c9640ef70d1fd4082',
                      u'port_specs': None,
                      u'hostname': u'2c1b05d4dd63',
                      u'mac_address': u'',
                      u'working_dir': u'',
                      u'entrypoint': [u'/usr/local/bin/dockerjenkins.sh'],
                      u'env': [
                              u'PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin',
                              u'REFRESHED_AT=2014-10-14',
                              u'JENKINS_HOME=/opt/jenkins/data',
                              u'JENKINS_MIRROR=http://mirrors.jenkins-ci.org'
                      ],
                      u'memory': 0,
                      u'attach_stdout': False,
                      u'exposed_ports': {
                          u'8080/tcp': {}
                      },
                      u'stdin_once': False,
                      u'cpuset': u'',
                      u'user': u'',
                      u'network_disabled': False,
                      u'memory_swap': 0,
                      u'attach_stderr': False,
                      u'cmd': [
                          u'/bin/sh',
                          u'-c',
                          u'#(nop) ENTRYPOINT [/usr/local/bin/dockerjenkins.sh]'
                      ],
                      u'open_stdin': False,
                      u'volumes': {
                          u'/var/lib/docker': {}
                      },
                      u'cpu_shares': 0
                  },
                  u'architecture': u'amd64',
                  u'docker_version': u'1.3.0',
                  u'config': {
                      u'tty': False,
                      u'on_build': [],
                      u'domainname': u'',
                      u'attach_stdin': False,
                      u'image': u'14e75a5684c2fabb7db24d92bdda09d11da1179a7d86ab4c9640ef70d1fd4082',
                      u'port_specs': None,
                      u'hostname': u'2c1b05d4dd63',
                      u'mac_address': u'',
                      u'working_dir': u'',
                      u'entrypoint': [u'/usr/local/bin/dockerjenkins.sh'],
                      u'env': [
                          u'PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin',
                          u'REFRESHED_AT=2014-10-14',
                          u'JENKINS_HOME=/opt/jenkins/data',
                          u'JENKINS_MIRROR=http://mirrors.jenkins-ci.org'
                      ],
                      u'memory': 0,
                      u'attach_stdout': False,
                      u'exposed_ports': {
                          u'8080/tcp': {}
                      },
                      u'stdin_once': False,
                      u'cpuset': u'',
                      u'user': u'',
                      u'network_disabled': False,
                      u'memory_swap': 0,
                      u'attach_stderr': False,
                      u'cmd': None,
                      u'open_stdin': False,
                      u'volumes': {
                          u'/var/lib/docker': {}
                      },
                      u'cpu_shares': 0
                  },
                  u'id': u'd37e267af092e02aaab68e962fadcc1107a3b42a34b0c581ee1e3a54aed62ad4',
                  u'size': 0
              }
          """
          # validate
          try:
              response = normalize_keys(self.client.inspect_image(identifier))
  
              self.comment = response['comment'] if response['comment'] else None
              self.id = response["id"]
              self.virtual_size = response['virtual_size']
              self.container = response['container']
              self.os = response['os']
              self.parent = response['parent']
              self.author = response.get('author', None)
              self.created_at = self.created_at = dateutil.parser.parse(response['created'], ignoretz=True)
              self.architecture = response['architecture']
              self.docker_version = response['docker_version']
              self.size = response['size']
              self.container_config = ContainerConfig(response.get('container_config')) if response.get('config') else ContainerConfig()
              self.config = ContainerConfig(response.get('config')) if response.get('config') else ContainerConfig()
  
          except Exception as e:
              raise e