如果您想了解详细信息，则应该查看一下
objects.h（尤其是文件顶部的注释）。您
ctypes.c_byte(1)是一个Python对象：
>>> import sys>>> import ctypes>>> isinstance(ctypes.c_byte(1), object)True
如@Daniel所述，
sys.getsizeof获取该Python对象的大小。该Python对象大于C中相应的对象。请注意以下几点
object.h：
Objects are structures allocated on the heap. . . .The actual memory allocated for an objectcontains other data that can only be accessed after casting the pointerto a pointer to a longer structure type. This longer type must startwith the reference count and type fields; the macro PyObject_HEAD should beused for this.
换句话说，宏
PyObject_HEAD附加到每个对象的开头。这增加了Python对象的大小。
ctypes.sizeof另一方面，返回
CPython对象中数据类型的实际大小（使用C的
sizeof运算符）。
编辑
根据您在Daniel的评论中提到的目标，可以在Python
3.x中通过服务器发送一个字节。下面是一个示例，说明如何使用Python的
socket模块发送字节来证明这一点。
这是服务器，您将在一个Python解释器中运行该服务器：
# Serverimport socketHOST = ''# All available interfacesPORT = 50007 # Same port as clients = socket.socket(socket.AF_INET, socket.SOCK_STREAM)s.bind((HOST, PORT))s.listen(1)conn, addr = s.accept()print('Connected by', addr)while True: data = conn.recv(1) # receive data with bufsize 1; a larger bufsize will break this pre if not data: break conn.sendall(data)conn.close()这是客户端，您将在另一个python解释器中运行该客户端：
# Clientimport socketHOST = '127.0.0.1' # The remote host, but here using localhostPORT = 50007 # The port used by both the client and servers = socket.socket(socket.AF_INET, socket.SOCK_STREAM)s.connect((HOST, PORT))s.sendall(b'1') # a bytes objectdata = s.recv(1) # Receive data from the socket with bufsize of 1s.close()print('Received', repr(data)) # confirm receipt
