<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def pull_byte(self, stack_pointer):
 """ pulled a byte from stack """

        addr = stack_pointer.value
        byte = self.memory.read_byte(addr)
#        log.info(
#         log.error(
#            "%x|\tpull $%x from %s stack at $%x\t|%s",
#            self.last_op_address, byte, stack_pointer.name, addr,
#            self.cfg.mem_info.get_shortest(self.last_op_address)
#        )

        # FIXME: self.system_stack_pointer += 1
        stack_pointer.increment(1)

        return byte