静态方法
与类无关,不能访问类里的任何属性和方法
类方法
只能访问类变量
属性@property
把一个方法变成一个静态属性,
flight.status
@status.setter
flight.status = 3
@status.delter
反射
getattr(obj,str)
setattr(obj,str,val)
hasattr(obj,str)
delattr(obj,str)
__new__
class Foo(object):
def __call__()
print"call"
Foo()() #执行call方法
__metaclass__ 用来定义这个类以怎样的形式被创建
try
...
except (ValueError,KeyError),e #in 2.7
except (ValueError,KeyError) as e : 3.x
except Exception as e:放在异常处理最后面,
else: #没发生异常,就执行
finally, 无论如何都执行
raise ValueError
断言
assert type(obj.name) is int
print(obj.name /2)
socket
tcp/ip send, recv
udp
family address
AF.INET ipv4
AF.INET6
AF.UNIX 。local
socket protocol type
sock.SOCK_STREAM tcp/ip
socket.SOCK_DGRAM 数据报式socket , for UDP
服务端
server = socket.socket(AF.INET,sock.SOCK_STREAM)
server.bind(localhost,9999)
server.listen()
while True:
conn,addr = server.accept() #阻塞
while True:
print("new conn",addr)
data = conn.recv(1024) #8192 #recv默认是阻塞的
if not data:
break #客户端已断开, conn.recv收到的就都是空数据,
print(data)
conn.send(data.upper())
client
client = socket.socket()
client.connect(serverip, 9999 )
client.send(data)
client.send(data)
client.recv(dat)
socket 粘包
原文地址:https://www.cnblogs.com/Dev0ps/p/9886418.html