python - 执行pymysql.connect时报错Keyerror 255

Question

这是代码

import pymysql
pymysql.connect(
    host='localhost',
    port=3306,
    user='root',
    password='iDontWannaSay',
    db='iDontWannaShow',
    charset='utf8'
)

错误回溯是:

data is :::::b'\xff\x02\x00\xff\x81\x15'....##### I was add near line 1279 which is print("data is :::::%s...."%data[i:i+6])
Traceback (most recent call last):
  File "C:\Users\123\Desktop\pymysqldebug.py", line 8, in <module>
    charset='utf8'
  File "D:\Program Files (x86)\Python\Python35\lib\site-packages\pymysql\__init__.py", line 90, in Connect
    return Connection(*args, **kwargs)
  File "D:\Program Files (x86)\Python\Python35\lib\site-packages\pymysql\connections.py", line 709, in __init__
    self.connect()
  File "D:\Program Files (x86)\Python\Python35\lib\site-packages\pymysql\connections.py", line 934, in connect
    self._get_server_information()
  File "D:\Program Files (x86)\Python\Python35\lib\site-packages\pymysql\connections.py", line 1279, in _get_server_information
    self.server_charset = charset_by_id(lang).name
  File "D:\Program Files (x86)\Python\Python35\lib\site-packages\pymysql\charset.py", line 39, in by_id
    return self._by_id[id]
KeyError: 255

似乎 struct.unpack 方法将 '\xff\' 解析为 255 并分配给 self.server_language，无论传递的非空字符集参数如何。

这是MySQL版本问题吗？(version 8.0.1-dmr)

Answer 1

要扩展上述仅接受链接的答案，请考虑对当前的 pymysql 安装进行以下更改。对于 MySQL 8，mysql-python API 无法识别可能较新的字符集，因此会引发 KeyError。

要解决此问题，请在该目录中找到的 pymysql 模块下找到 connectors.py 脚本:

print(pymysql.__file__)

备份原始 connectors.py 脚本。然后合并以下更改。

原创(第 1268-1269 行)

self.server_language = lang
self.server_charset = charset_by_id(lang).name  

替换 (第 1268 - 1272 行)

self.server_language = lang
try:
    self.server_charset = charset_by_id(lang).name
except KeyError:
    self.server_charset = None

小心将隐藏的标签包含在上面几行的缩进中。

引用

• PyMySQL Git fix #591