code: def build_dependencies(self):
          '''build_dependencies
  
          High-level api: Briefly compile all yang files and find out dependency
          infomation of all modules.
  
          Returns
          -------
  
          None
              Nothing returns.
          '''
  
          cmd_list = ['pyang', '--plugindir', self.pyang_plugins]
          cmd_list += ['-p', self.dir_yang]
          cmd_list += ['-f', 'pyimport']
          cmd_list += [self.dir_yang + '/*.yang']
          logger.info('Building dependencies: {}'.format(' '.join(cmd_list)))
          p = Popen(' '.join(cmd_list), shell=True, stdout=PIPE, stderr=PIPE)
          stdout, stderr = p.communicate()
          logger.info('pyang return code is {}'.format(p.returncode))
          logger.debug(stderr.decode())
          parser = etree.XMLParser(remove_blank_text=True)
          self.dependencies = etree.XML(stdout.decode(), parserf build_dependencies(self):
          '''build_dependencies
  
          High-level api: Briefly compile all yang files and find out dependency
          infomation of all modules.
  
          Returns
          -------
  
          None
              Nothing returns.
          '''
  
          cmd_list = ['pyang', '--plugindir', self.pyang_plugins]
          cmd_list += ['-p', self.dir_yang]
          cmd_list += ['-f', 'pyimport']
          cmd_list += [self.dir_yang + '/*.yang']
          logger.info('Building dependencies: {}'.format(' '.join(cmd_list)))
          p = Popen(' '.join(cmd_list), shell=True, stdout=PIPE, stderr=PIPE)
          stdout, stderr = p.communicate()
          logger.info('pyang return code is {}'.format(p.returncode))
          logger.debug(stderr.decode())
          parser = etree.XMLParser(remove_blank_text=True)
          self.dependencies = etree.XML(stdout.decode(), parser)
docs: build_dependencies
  
          High-level api: Briefly compile all yang files and find out dependency
          infomation of all modules.
  
          Returns
          -------
  
          None
              Nothing returns.