code: def _build_command(self, python_executable, lib_dir_fq, proxy_enabled):
          
          exe_command = [
              os.path.expanduser(python_executable),
              '-m',
              'pip',
              'install',
              '-r',
              self.requirements_file,
              '--ignore-installed',
              '--quiet',
              '--target',
              lib_dir_fq,
          ]
          if self.args.no_cache_dir:
              exe_command.append('--no-cache-dir')
  
          if proxy_enabled:
              # trust the pypi hosts to avoid ssl errors
              trusted_hosts = ['pypi.org', 'pypi.python.org', 'files.pythonhosted.org']
  
              for host in trusted_hosts:
                  exe_command.append('--trusted-host')
                  exe_command.append(host)
  
          return exe_command
docs: Build the pip command for installing dependencies.
  
          Args:
              python_executable (str): The fully qualified path of the Python executable.
              lib_dir_fq (str): The fully qualified path of the lib directory.
  
          Returns:
              list: The Python pip command with all required args.