Python计算文件MD5值

import hashlib
def fileMD5(filename):
    m = hashlib.md5()    #md5计算
    #m = hashlib.sha1()   #sha1计算
    #m = hashlib.sha224()   #sha224计算
    #m = hashlib.sha256()    #sha256计算
    #m = hashlib.sha384()    #sha384计算
    #m = hashlib.sha512()    #sha512计算
    #
    with open(filename) as f:
        while True:
            data = f.read(4096)
            if len(data) == 0:
                break
            m.update(data)
    return m.hexdigest()
if __name__ == '__main__':
    fileMD5('xxxxx.xxx')