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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 paths(self):
 """Get list of paths to look in for configuration data"""

        filename = '.mbed_cloud_config.json'
        return [
            # Global config in /etc for *nix users
            "/etc/%s" % filename,

            # Config file in home directory
            os.path.join(os.path.expanduser("~"), filename),

            # Config file in current directory
            os.path.join(os.getcwd(), filename),

            # Config file specified using environment variable
            os.environ.get(self.path_from_env_key)
        ]