def CheckDependencies(self, verbose_output=True):
    """Checks the availability of the dependencies.

    Args:
      verbose_output (Optional[bool]): True if output should be verbose.

    Returns:
      bool: True if the dependencies are available, False otherwise.
    """
    print('Checking availability and versions of dependencies.')
    check_result = True

    for module_name, dependency in sorted(self.dependencies.items()):
      if module_name == 'sqlite3':
        result, status_message = self._CheckSQLite3()
      else:
        result, status_message = self._CheckPythonModule(dependency)

      if not result and module_name == 'lzma':
        dependency.name = 'backports.lzma'
        result, status_message = self._CheckPythonModule(dependency)

      if not result and not dependency.is_optional:
        check_result = False

      self._PrintCheckDependencyStatus(
          dependency, result, status_message, verbose_output=verbose_output)

    if check_result and not verbose_output:
      print('[OK]')

    print('')
    return check_result
Checks the availability of the dependencies.

    Args:
      verbose_output (Optional[bool]): True if output should be verbose.

    Returns:
      bool: True if the dependencies are available, False otherwise.