解决办法

import pymysql

user = input("user>>>").strip()
pwd = input("password>>>").strip()

# 建立连接
conn = pymysql.connect(host="127.0.0.1", port=3306, user=‘root‘, password=‘password‘, db=‘test‘, charset=‘utf8‘)

# 游标
cursor = conn.cursor()

# 执行sql语句
sql = "select * from userinfo where user=‘%s‘ and password = ‘%s‘" % (user, pwd)

# 受影响的行数
rows = cursor.execute(sql)

cursor.close()
conn.close()

if rows:
    print("登录成功")
else:
    print("登录失败")

将charset="utf-8" 改为utf8即可

python pymysql连接数据库 提示 'NoneType' object has no attribute 'encoding'