python renames all file instances in the folder based on list

As shown below:

# coding = utf-8
import os
path = "D:\\chunyu"# You want to rename the folder where all your files are stored 
filelist = os.listdir(path) # All files under this folder (including folders) 
list = []
fileopen = open('D:\chunyu.txt','r')# A collection of all the names you want to rename later, which is the file name with the file extension removed 
i =0
for file in filelist:
 print(file)
for line in fileopen:
 line = line.strip('\n')
 list.append(line)# read txt Write a set of all the names inside list file 
print(list)
fileopen.close()
 
for file in filelist: # Iterate over all the files 
 Olddir=os.path.join(path,file) # The original file path 
 if os.path.isdir(Olddir): # If it is a folder, skip it 
 continue
 filename=os.path.splitext(file)[0] # The file name 
 filetype=os.path.splitext(file)[1] # File extension 
 Newdir=os.path.join(path,str(list[i])+filetype)
 os.rename(Olddir,Newdir)# rename 
 print(Olddir+" has changed as "+Newdir)
 i = i+1
 print(i)