NNTPContent.py 文件源码

def sha256(self):
        """
        Simply return the sha256 hash value associated with the content file.

        If the file can't be accessed, then None is returned.
        """
        sha256 = hashlib.sha256()
        if self.open(mode=NNTPFileMode.BINARY_RO):
            for chunk in \
                    iter(lambda: self.stream.read(128*sha256.block_size), b''):
                sha256.update(chunk)
            return sha256.hexdigest()
        return None