1.python自帶資料庫，此處使用MYSQL資料庫，編寫資料庫類做資料庫處理，編寫excel 類處理excel的讀寫，下面程式碼可以實現從excel讀取資料寫入資料庫，從資料庫讀取資料寫入excel:　

import xlrd,xlwt
import pymysql

class Mysql:
    def __init__(self):
        self.content = pymysql.Connect(
            host='192.168.207.63',  # mysql的主機ip
            port=32774,  # 埠
            user='
 
root',  # 使用者名稱
            passwd='123456',  # 資料庫密碼
            db='test',  # 資料庫名
            charset='utf8',  # 字符集
        )
        self.cursor = self.content.cursor()

    def query(self):
        sql = "select grade,teacher,location from grade;"
        self.cursor.execute(sql)        
        
 
for row in self.cursor.fetchall():
            print("grade:%s\t teacher:%s\t location:%s" % row)
            rows.append(row)
        print(f"一共查詢到：{self.cursor.rowcount}")          
        
    def readtable(self):
        sql = """select * from stu;"""
        self.cursor.execute(sql)
        rows
 
= []
        for row in self.cursor.fetchall():
            print(row)
            rows.append(row)
        print(f"一共查詢到：{self.cursor.rowcount}")  
        return rows


    def insert(self,grade,teacher,location):
        sql = """INSERT INTO grade(grade,teacher,location) VALUES(%s,%s,%s)"""
        values=(int(grade),str(teacher),str(location))        
        try:
            self.cursor.execute(sql,values)
            self.content.commit()
           # print("插入成功")
        except:
            self.content.rollback
           # print("插入失敗")
           
    def end(self):
        self.cursor.close()
        self.content.close()

class Exceltable:
    def __init__(self):
        self.book = xlrd.open_workbook("grade.xls")  #檔名，把檔案與py檔案放在同一目錄下
        self.sheet = self.book.sheet_by_name("Sheet1")   #execl裡面的worksheet1    
        
    def readrow(self,row):
        #ctype： 0 empty,1 string, 2 number, 3 date, 4 boolean, 5 error
        row_values = []
        for i in range(self.sheet.ncols):
            cell=self.sheet.cell_value(row,i)
            ctype = self.sheet.cell(row,i).ctype
            if ctype == 2 and cell%1== 0:
                cell =int(cell)
            elif ctype == 3:
                # 轉成datetime物件
                date = datetime(*xldate_as_tuple(cell, 0))
                cell = date.strftime('%Y/%d/%m %H:%M:%S')
            elif ctype == 4:
                cell = True if cell == 1 else False
            row_values.append(cell)
        return row_values        

    def readall(self):
        #ctype： 0 empty,1 string, 2 number, 3 date, 4 boolean, 5 error
        all_content = []
        for i in range(1,self.sheet.nrows):
            row_values = []            
            for j in range(self.sheet.ncols):
                cell=self.sheet.cell_value(i,j)
                ctype = self.sheet.cell(i,j).ctype
                if ctype == 2 and cell%1== 0:
                    cell =int(cell)
                elif ctype == 3:
                    # 轉成datetime物件
                    date = datetime(*xldate_as_tuple(cell, 0))
                    cell = date.strftime('%Y/%d/%m %H:%M:%S')
                elif ctype == 4:
                    cell = True if cell == 1 else False
                row_values.append(cell)
            all_content.append(row_values)
        return all_content 
        
    def readmutirow(self,start,end):
        muti_content = []
        for i in range(start,end+1):
            row_values = []            
            for j in range(self.sheet.ncols):
                cell=self.sheet.cell_value(i,j)
                ctype = self.sheet.cell(i,j).ctype
                if ctype == 2 and cell%1== 0:
                    cell =int(cell)
                elif ctype == 3:
                    # 轉成datetime物件
                    date = datetime(*xldate_as_tuple(cell, 0))
                    cell = date.strftime('%Y/%d/%m %H:%M:%S')
                elif ctype == 4:
                    cell = True if cell == 1 else False
                row_values.append(cell)
            muti_content.append(row_values)
        return muti_content   

    def writrow(self,rows):
        # 建立Excel工作薄
        myWorkbook = xlwt.Workbook()
        # 3. 新增Excel工作表
        mySheet = myWorkbook.add_sheet('test')
        # 4. 寫入資料
        #myStyle = xlwt.easyxf('font: name Times New Roman, color-index red, bold on', num_format_str='#,##0.00')   #資料格式
        for i in range(len(rows)):
            for j in range(len(rows[i])):
                mySheet.write(i, j, rows[i][j])                          #寫入A3，數值等於1
        #5. 儲存
        myWorkbook.save('Wtest.xls')
    
if __name__ == '__main__':
    mysql = Mysql()    
    myexcel=Exceltable()
    
    #讀單行
    #cells=myexcel.readrow(3)
    #print(cells)
    
    #讀整個表
    #all_content = myexcel.readall()
    #for cells in all_content:
    #    print(cells)
    #    mysql.insert(cells[0],cells[1],cells[2])
    
    #讀指定表
    #muti_content=myexcel.readmutirow(1,3)
    #for cells in  muti_content:
    #    print(cells)
    #    mysql.insert(cells[0],cells[1],cells[2])
    
    #查詢資料庫
    #mysql.query()
    #將資料庫內容寫入EXCEL
    rows=mysql.readtable()    
    myexcel.writrow(rows)
    mysql.end()

上面程式存在缺陷：1.處理資料量小，不適合大量資料處理，2.使用xlwt庫寫excel只支援.xls且僅支援新建，後續學習PANDAS後補充此章內容