在网上找的xlsx文件转txt文件的代码，请问哪里出了问题呢，还有就是请问python要怎么学呀，以及如果想要找到python相关的工作，应该具备什么基础知识呢，请求各位大佬解答

import os
import time
import pandas as pd
import openpyxl

inpath  = r"d:/software/python/learning/数据/旅游景点"
outpath = r"d:/software/python/learning/数据/旅游景点"

for filename in os.listdir(inpath):
    if filename[-4:].lower() == 'xlsx':
        source = inpath + '/' + filename
        print(filename)
        wb = openpyxl.load_workbook(source)
        for sheet in wb.sheetnames:
            destination = outpath + '/' + filename[:-5] + '_' + sheet + '.txt'
            print(f">>> {filename[:-5] + '_' + sheet + '.txt'}")
            df = pd.read_excel(source, sheet_name=sheet, header=None)
            df.to_csv(destination, header=None, sep=',', index=False)Copy