pythonは、既存のcsvファイルデータに差を付けた後、新しいファイルとして保存し、ファイル名は変更されません.

import pandas as pd
import numpy as np
import glob,os
import matplotlib.pylab as plt
from scipy import interpolate
save_wav_file = "E:\
ew_CO\\WAV"  #   csv      
path = r'E:\
ew_CO\\wav_data'#     csv     
file = glob.glob(os.path.join(path, "*.csv"))
# print(file)
dl = []
for f in file:
    dl.append(f)
def read(  ):
    for  i in  dl:
        df = pd.read_csv(i)
        ABP = df['values'].tolist()
        m = 120
        x=[i for i in range (1,len (ABP)+1)]
        xi = np.linspace(1,len(ABP), m)
        f = interpolate.interp1d(x, ABP,kind='slinear')
        yi=f(xi)
        wav_name=i.split("\\")[-1]
        # f = open('E:\
ew_CO\\WAV', 'w', encoding='utf-8')
        wav = pd.DataFrame({
     "values": yi})
        wav.to_csv(os.path.join(save_wav_file, wav_name), index=False)
read()