import os
path="D:/数据/测试数据"
def rename (path):
filenames = os.listdir(path)
for filename in filenames:
lowerfilename = filename.lower()
file = os.path.join(path,filename)
new_file = os.path.join(path,lowerfilename)
if os.path.isdir(file):
rename(file)
else:
os.rename(file,new_file)
rename(path)