PyMySQL访问被拒绝“使用密码（否）”但使用密码

这是我正在使用的代码：

cOnn= pymysql.connect(host='localhost', port=3306, user='root', password='placeholder', db='CustomerInfo')

Python返回以下内容：

Traceback (most recent call last):
  File "D:\Python\FileCheck.py", line 38, in 
    cOnn= pymysql.connect(host='localhost', port=3306, user='root', password='placeholder', db='CustomerInfo')
  File "C:\Program Files\Python36\lib\site-packages\pymysql\__init__.py", line 90, in Connect
    return Connection(*args, **kwargs)
  File "C:\Program Files\Python36\lib\site-packages\pymysql\connections.py", line 704, in __init__
    self.connect()
  File "C:\Program Files\Python36\lib\site-packages\pymysql\connections.py", line 974, in connect
    self._request_authentication()
  File "C:\Program Files\Python36\lib\site-packages\pymysql\connections.py", line 1203, in _request_authentication
    auth_packet = self._read_packet()
  File "C:\Program Files\Python36\lib\site-packages\pymysql\connections.py", line 1059, in _read_packet
    packet.check_error()
  File "C:\Program Files\Python36\lib\site-packages\pymysql\connections.py", line 384, in check_error
    err.raise_mysql_exception(self._data)
  File "C:\Program Files\Python36\lib\site-packages\pymysql\err.py", line 109, in raise_mysql_exception
    raise errorclass(errno, errval)
pymysql.err.OperationalError: (1045, "Access denied for user 'root'@'localhost' (using password: NO)")

我已经确认通过MySQL Workbench 登录时可以访问数据库。奇怪的是，"using password: NO"即使我发送密码，Python也会告诉我。

我尝试在脚本中更改passwd为"password"，并使用适当的权限创建一个新用户。两者都没有起作用。

不知道下一步要检查什么。

编辑：这是根的授予：

GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, RELOAD, SHUTDOWN, PROCESS, FILE, REFERENCES, INDEX, ALTER, SHOW DATABASES, SUPER, CREATE TEMPORARY TABLES, LOCK TABLES, EXECUTE, REPLICATION SLAVE, REPLICATION CLIENT, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, CREATE USER, EVENT, TRIGGER, CREATE TABLESPACE, CREATE ROLE, DROP ROLE ON *.* TO `root`@`localhost` WITH GRANT OPTION
GRANT BACKUP_ADMIN,BINLOG_ADMIN,CONNECTION_ADMIN,ENCRYPTION_KEY_ADMIN,GROUP_REPLICATION_ADMIN,PERSIST_RO_VARIABLES_ADMIN,REPLICATION_SLAVE_ADMIN,RESOURCE_GROUP_ADMIN,RESOURCE_GROUP_USER,ROLE_ADMIN,SET_USER_ID,SYSTEM_VARIABLES_ADMIN,XA_RECOVER_ADMIN ON *....
GRANT ALL PRIVILEGES ON `customerinfo`.* TO `root`@`localhost` WITH GRANT OPTION
GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION

编辑2：在connections.py中 添加了用于连接的调试行和_request_authentication。

这是最新的：

C:\Users\Paul Miller>python.exe D:\Python\FileCheck.py
** DEBUG 1 **
connect, line 973
host= localhost
user= root
password= placeholder


** DEBUG 2 **
_request_authentication line 1172
user= root
password= placeholder


Traceback (most recent call last):
  File "D:\Python\FileCheck.py", line 38, in 
    cOnn= pymysql.connect(host='localhost', port=3306, user='root', password='placeholder', db='CustomerInfo')
  File "C:\Program Files\Python36\lib\site-packages\pymysql\__init__.py", line 90, in Connect
    return Connection(*args, **kwargs)
  File "C:\Program Files\Python36\lib\site-packages\pymysql\connections.py", line 704, in __init__
    self.connect()
  File "C:\Program Files\Python36\lib\site-packages\pymysql\connections.py", line 982, in connect
    self._request_authentication()
  File "C:\Program Files\Python36\lib\site-packages\pymysql\connections.py", line 1218, in _request_authentication
    auth_packet = self._read_packet()
  File "C:\Program Files\Python36\lib\site-packages\pymysql\connections.py", line 1067, in _read_packet
    packet.check_error()
  File "C:\Program Files\Python36\lib\site-packages\pymysql\connections.py", line 384, in check_error
    err.raise_mysql_exception(self._data)
  File "C:\Program Files\Python36\lib\site-packages\pymysql\err.py", line 109, in raise_mysql_exception
    raise errorclass(errno, errval)
pymysql.err.OperationalError: (1045, "Access denied for user 'root'@'localhost' (using password: NO)")

编辑3：启用日志记录。日志中没有任何意外，但是这是最新尝试生成的结果：

2018-05-15T10:27:15.197445Z    43 Connect   root@localhost on CustomerInfo using TCP/IP
2018-05-15T10:27:15.197540Z    43 Connect   Access denied for user 'root'@'localhost' (using password: NO)

编辑4：发现了问题。我添加了一些调试语句，如下所示：

    if self._auth_plugin_name in ('', 'mysql_native_password'):
        print("** DEBUG 3 **")
        print(self.password)
        print("\n")
        authresp = _scramble(self.password.encode('latin1'), self.salt)

问题是该IF块失败了……程序流没有到达“ authresp”语句。当我的同伴运行相同的程序时，其密码将在控制台中打印。

所以，现在我只需要弄清楚为什么我不去这个分支。

将MySQL从8.0.11.0降级到5.7.22后，解决了该问题。

除了我在原始问题中列出的内容之外，我还尝试了以下操作：

安装了较低版本的PyMySQL（在我的情况下为0.8.1至0.8.0）

完全删除了两个版本的PyMySQL并安装了v0.8.0

删除了MySQL 8.0并重新安装

当以上方法均无效时，我将MySQL降级至v5.7，这是我的同辈使用的。那解决了错误。