执行 pymysql.connect 时出现错误 Keyerror 255

Question

这里是代码

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

并且错误 Traceback 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？（版本8.0.1-dmr）

Answer 1

要扩展上述仅接受链接的答案，请考虑对您当前的pymysql 安装进行以下更改。在 MySQL 8 中，mysql-python API 无法识别可能更新的字符集，因此引发了KeyError。

要解决此问题，请在此目录中的 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。

原文 （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

小心在上述行的缩进中包含隐藏的标签。

参考

• PyMySQL Git fix #591

Answer 2

但是你的变量在哪里？

import pymysql

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