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DELETE FROM 資料表 WHERE 欄位1 = '值1'

sql_4="DELETE FROM staff_info WHERE sf_pk = '1'"
print(sql_4)
cur.execute(sql_4)
data=cur.fetchone()   

刪除sf_pk=1 這筆資料 

DELETE FROM staff_info WHERE sf_pk = '1'

def DEL_account():
    while True:
        acc=input("請輸入要刪除的帳號")
        if acc=="":break
        sql_4="SELECT sf_name,sf_account,sf_pwd,sf_del FROM staff_info WHERE sf_account='"+ acc +"'"
        cur.execute(sql_4)
        data=cur.fetchone()
    
        if(data == None):
            print("{}帳號不存在".format(acc)) 
            continue
        print("你確定真的要刪除{}這個帳號嗎".format(acc))
        check=input("(Y/N)?")
        if(check=="Y" or check=="y"):
            sql_5="DELETE FROM staff_info WHERE sf_account='"+acc+"'"
            cur.execute(sql_5)
            conn.commit()
            input("刪除成功，請輸入任意鍵回首頁")
            break

def mymenu2():        
    while True:
        myindex2()
        item=int(input("請輸入您執行的動作"))
        if item == 1 :
            get_staff_data()
        elif item == 2 :
            update_name()
        elif item == 3 :
            DEL_account()
        elif item == 4 :
            break

完整程式碼:

import pymysql
conn = pymysql.connect(host='localhost',user='root',passwd='',db='my_python_db',charset='utf8')
cur = conn.cursor()

def myindex():
    print("管理者登入系統")
    print("*----------------*")
    print("1.登入")
    print("2.註冊帳號")
    print("3.結束程式")
    
def myindex2():
    print("請選擇您要做的項目")
    print("*-------------*")
    print("1.查詢所有員工的資料")
    print("11.查詢員工的資料")
    print("2.修改員工資料")
    print("3.刪除員工的帳號")
    print("4.離開")         

def login_staff():
    while True:
        acc=input("請輸入帳號")
        if acc == "":break   
        sql_1="SELECT sf_name,sf_account,sf_pwd FROM staff_info WHERE sf_account ='" + acc + "' AND sf_del ='0'"
        cur.execute(sql_1)
        staff_acc= cur.fetchone()   
        print(staff_acc)
        if (staff_acc==None):
            print("{}帳號不存在".format(acc))
            continue
        mypwd=staff_acc[2]
        print(mypwd)
        pwd=input("請輸入密碼")
        if pwd=="": break  
        if (mypwd != pwd):
            print("密碼錯誤")
        else:
            print()
            print("登入成功")
            print()
            mymenu2()
            break   
        
def get_staff_info():
    sql = "SELECT sf_pk,sf_name,sf_account,sf_pwd,sf_level,sf_del FROM staff_info WHERE sf_del = 0 "
    cur.execute(sql)
    staff_data = cur.fetchall()
    return staff_data

def get_staff_info_one():
    
    choose=input("請輸入您要搜尋的欄位 1. 姓名 2. 帳號")
    if(choose=='1'):
        name=input("請輸入姓名:")
        sql_1="SELECT sf_name,sf_account,sf_pwd FROM staff_info WHERE sf_name ='" + name + "' AND sf_del ='0'"
                
    else:
        account=input("請輸入帳號:")
        sql_1="SELECT sf_name,sf_account,sf_pwd FROM staff_info WHERE sf_account ='" + account + "' AND sf_del ='0'"
        
    cur.execute(sql_1)
    staff_data= cur.fetchone()     
    return staff_data

def Insert_staff_data():
    while True:
        name=input("請輸入姓名")
        if name == "" : 
            print("姓名不能為空")
            continue
            
        acc=input("請輸入帳號")
        if acc == "" :
            print("帳號不能為空")
            continue
        sql = "SELECT * FROM staff_info WHERE sf_account = '"+ acc + "'"
        cur.execute(sql)
        data = cur.fetchone()
        if not data == None:
            print("{}帳號已存在".format(acc))
            continue
        pwd = input("請輸入密碼")
        sql_insert = "INSERT INTO staff_info(sf_name,sf_account,sf_pwd,create_user,update_user)VALUES('"+name+"','"+acc+"','"+pwd+"','"+name+"','"+name+"')" 
        #print(sql_insert)
        cur.execute(sql_insert)
        conn.commit() 
        print("{}已註冊成功".format(acc))
        break
def update_name():
    while True:
        acc=input("請輸入要修改的帳號")
        if acc=="":break
        sql_2 = "SELECT sf_name,sf_account,sf_pwd,sf_del FROM staff_info WHERE sf_account='" + acc + "'"
        cur.execute(sql_2)
        staff_data=cur.fetchone()
        if(staff_data==None):
            print("{}無此帳號".format(acc))
            continue
        print(staff_data)
        newname = input("請輸入新的姓名")
        sql_3= "UPDATE staff_info SET sf_name='"+ newname +"' WHERE sf_account='"+acc+"'"
        cur.execute(sql_3)
        conn.commit()
    
        cur.execute(sql_2)
        person=cur.fetchone()
        print(person)
        input("修改成功，請按任意鍵回首頁")
        break
    
def DEL_account():
    while True:
        acc=input("請輸入要刪除的帳號")
        if acc=="":break
        sql_4="SELECT sf_name,sf_account,sf_pwd,sf_del FROM staff_info WHERE sf_account='"+ acc +"'"
        cur.execute(sql_4)
        data=cur.fetchone()
    
        if(data == None):
            print("{}帳號不存在".format(acc)) 
            continue
        print("你確定真的要刪除{}這個帳號嗎".format(acc))
        check=input("(Y/N)?")
        if(check=="Y" or check=="y"):
            sql_5="DELETE FROM staff_info WHERE sf_account='"+acc+"'"
            cur.execute(sql_5)
            conn.commit()
            input("刪除成功，請輸入任意鍵回首頁")
            break
        
def mymenu2():        
    while True:
        myindex2()
        item=int(input("請輸入您執行的動作"))
        if item == 1 :
            staff_info=get_staff_info();
            print(staff_info)
        elif item == 11 :
            info=get_staff_info_one()
            print(info)
                
        elif item == 2 :
            update_name()
        elif item == 3 :
            DEL_account()
        elif item == 4 :
            break            
    
def mymenu():
    while True:
        myindex() #呼叫起始介面
        num = int(input("請輸入您要執行的動作"))
        print()
        if num == 1 :
            login_staff()
        elif num == 2 :
            Insert_staff_data()
            print("登入功能")
        elif num == 3 :
            break #離開迴圈

#主程式
mymenu()
  

#關閉資料庫連線
cur.close()
conn.close()

這邊建議還是用軟刪除的方式 使用UPDATE()方式去改變欄位名稱 sf_del = 0 為正常資料 1為刪除資料

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