<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _unpack(self, content):
 """unpack cache using serializer and compressor"""

        if self.compressor:
            try:
                content = self.compressor.decompress(content)
            except CompressError:
                pass
        if self.serializer:
            content = self.serializer.deserialize(content)
        return content