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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _env_or_config_or_default(self, env=None, file=None, section=None, name=None, default=None):
 """ Get the value of the environment variable or config file value. The environment variable takes precedence. :param env: The environment variable name. :param name: The config file key. :return: The value or None if not found """

        env_val = environ.get(env)
        if env_val is not None:
            return env_val

        try:
            return self.configparsers[file].get(section, name)
        except (NoSectionError, NoOptionError, KeyError):
            return default