Python 名称错误：名称'；光标'；没有定义

我正在尝试连接mysql并更改信息，但不起作用

main.py

import pymysql

def connect_setting():
    # Trying to connect
    db_connection = None
    try:
        db_connection = pymysql.connect(
        user='db', 
        passwd='password', 
        host='127.0.0.1', 
        db='test', 
        charset='utf8'
        )
       # If connection is not successful
    except:
        print("Can't connect to database")
        return 0
    # If Connection Is Successful
        print("Connected")

    # Making Cursor Object For Query Execution
        global cursor
        cursor = db_connection.cursor()


def get_off():

    sql = '''INSERT INTO `-100`'''

    cursor.execute(sql)
    db_connection.commit()

index.py

from main import get_off as sql

sql()

错误

raceback（最近一次通话最后一次）：
文件“/workspace/Kakao_points/index.py”，第3行，在
sql（）
文件“/workspace/Kakao_points/main.py”，第30行，在get_off中
cursor.execute（sql）
NameError:未定义名称“游标”

---

我已经定义了游标，但不知何故python并没有在下一个def中获得信息。。有人请帮忙吗？

连接失败时，您只需设置

光标

，因为您将这些行放在

块中，除了：

块。这两行应该在

try:

块中

您还需要将

db\u连接设置为全局连接

global，以便在其他功能中使用它

def connect_setting():
    global db_connection
    # Trying to connect
    db_connection = None
    try:
        db_connection = pymysql.connect(
        user='db', 
        passwd='password', 
        host='127.0.0.1', 
        db='test', 
        charset='utf8'
        )

        # Making Cursor Object For Query Execution
        global cursor
        cursor = db_connection.cursor()
        # If Connection Is Successful
        print("Connected")
    # If connection is not successful
    except:
        print("Can't connect to database")
        return 0

---

只有在出现异常时才分配

cursor

。我确实更改了与您相同的错误名称，但仍然是相同的错误名称error:name'cursor'未定义您是否收到

Connected

消息？是的，我还以为我没有打开mysql服务，但它已打开，python也打印“Connected”。我想不出原因。我更新了答案，说您还需要

全局db_连接

，但这并不影响

游标

。嗯，我仍然以另一种方式工作，但输出相同：C

def connect_setting():
    global db_connection
    # Trying to connect
    db_connection = None
    try:
        db_connection = pymysql.connect(
        user='db', 
        passwd='password', 
        host='127.0.0.1', 
        db='test', 
        charset='utf8'
        )

        # Making Cursor Object For Query Execution
        global cursor
        cursor = db_connection.cursor()
        # If Connection Is Successful
        print("Connected")
    # If connection is not successful
    except:
        print("Can't connect to database")
        return 0