excel文件的读写

def read_excel(excel_file: str,sheet_name: str,row_num: int = 0,col_num:int = 0) ->str
# 4个参数，分别对应文件名称，sheet名称，行号，列号,返回值是获取到的内容
return content

def write_excel(excel_file: str,sheet_name: str,row_num: int = 0,col_num:int = 0,content: str) -> boolean
# 4个参数，分别对应文件名称，sheet名称，行号，列号,返回值是获取到的内容

# 如果文件不存在，抛出文件不存在异常，手动抛一个自定义的文件不存在的异常

#如果写入成功则返回True
return True
#如果写入失败则返回False
return False

解答：

import xlwt
import xlrd
from xlutils.copy import copy

# 4个参数，分别对应文件名称，sheet名称，行号，列号,返回值是获取到的内容
def read_excel(excel_file, sheet_name, row_num = 0,col_num = 0):
    workbook = xlrd.open_workbook(excel_file)  # 打开工作簿
    print("读取的内容为：")
    print("-----------")
    if (row_num != 0 and col_num !=0):
         sheets = workbook.sheet_by_index(0)
         print(sheets.cell(row_num, col_num).value)  # 读取指定行和列获取数据
    else:
        sheets = workbook.sheet_names()  # 获取工作簿中的所有表格
        worksheet = workbook.sheet_by_name(sheets[0])  # 获取工作簿中所有表格中的的第一个表格
        for i in range(0, worksheet.nrows):
            for j in range(0, worksheet.ncols):
                print(worksheet.cell_value(i, j), "\t", end="")  # 逐行逐列读取数据
            print()

def write_excel(excel_file,sheet_name,row_num,col_num,content):
    index = len(content)  # 获取需要写入数据的行数
    workbook = xlwt.Workbook()  # 新建一个工作簿
    sheet = workbook.add_sheet(sheet_name)  # 在工作簿中新建一个表格
    #sheet.write(row_num,col_num,content[0][0])向某行某列写入内容
    for i in range(0, index):
        for j in range(0, len(content[i])):
            sheet.write(i, j, content[i][j])  # 像表格中写入数据（对应的行和列）
    workbook.save(excel_file)  # 保存工作簿
    print("xls格式表格写入数据成功！")
    return content
#追加内容
def write_excel_xls_append(path, value):
    index = len(value)  # 获取需要写入数据的行数
    workbook = xlrd.open_workbook(path)  # 打开工作簿
    sheets = workbook.sheet_names()  # 获取工作簿中的所有表格
    worksheet = workbook.sheet_by_name(sheets[0])  # 获取工作簿中所有表格中的的第一个表格
    rows_old = worksheet.nrows  # 获取表格中已存在的数据的行数
    new_workbook = copy(workbook)  # 将xlrd对象拷贝转化为xlwt对象
    new_worksheet = new_workbook.get_sheet(0)  # 获取转化后工作簿中的第一个表格
    for i in range(0, index):
        for j in range(0, len(value[i])):
            new_worksheet.write(i + rows_old, j, value[i][j])  # 追加写入数据，注意是从i+rows_old行开始写入
    new_workbook.save(path)  # 保存工作簿
    print("xls格式表格【追加】写入数据成功！")

#写入内容
book_name_xls = 'xls测试格式测试工作簿.xls'
sheet_name_xls = 'xls测试格式测试表'
value_title = [["姓名", "性别", "年龄", "城市", "职业"], ]
value1 = [["张三", "男", "19", "杭州", "研发工程师"],
          ["李四", "男", "22", "北京", "医生"],
          ["王五", "女", "33", "珠海", "出租车司机"], ]
rows_num = 3
col_num = 3
write_excel(book_name_xls,sheet_name_xls,rows_num,col_num,value_title)
write_excel_xls_append(book_name_xls, value1)
#读取内容
try:
    #当rows_num  col_num 值为0则读取所有，否则读取指定行列内容
    read_excel(book_name_xls,sheet_name_xls,rows_num,col_num)
except FileNotFoundError as e:
     print("读取发生异常了")
finally:
     print("---------")
     print("读取完毕")

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