python3 UnicodeEncodeError: 'gbk' codec can't encode character '\xa0' in position 30: illegal multibyte sequence

　　昨天用用python3寫個日志文件，結果報錯UnicodeEncodeError: 'gbk' codec can't encode character '\xa0' in position 30: illegal multibyte sequence

　　具體代碼是：

　　with open(fileName, 'a') as f：

　　　　f.write(message)

　　后來改成如下：

　　with open(fileName, 'a',encoding='utf-8') as f：

　　　　f.write(message)

　　就可以了。還是編碼的問題