python将文件夹名字改成大写 python修改文件夹名称

import os
import pandas as pd
import numpy as np
import netCDF4 as nc
# 需要修改的文件夹目录
path = r"D:\era5\era5"
# 文件名修改之后的目录
newpath = r"D:\wenjianmingxiugai"
# 获取文件夹path下的所有文件名称
files = os.listdir(path)
i = 0
for filename in files:
	# 将文件名分为 名称：portion[0]  后缀：portion[1]
    portion = os.path.splitext(filename)
    file = path + "\\"+filename
    newname = newpath + "\\"+ "新的文件名" + portion[1]
    oldname = path + "\\" + filename
    os.rename(oldname,newname)