使用python的path模块，global模块，re模块
首先提取脚本所在子目录文件名
realpath = os.path.realpath(__file__) 遍历子目录下的.JPG文件
file_list = glob.glob('*.'+extension)1.修改整个文件名，变成小写
lowerfilename = filename.lower()filepath = os.path.join(dirname, filename)os.rename(filepath, lowerfilename)2.仅仅修改文件名后缀变成小写
filepath = os.path.join(dirname, filename) if re.search(r'.JPG', filename) != None: filename = str.replace(filename, '.JPG', '.jpg') #filename=re.sub(r'.JPG', '.jpg', filename) print(filename) os.rename(filepath, filename)github代码：
https://github.com/A-mockingbird/Practice
