[英]Python custom readline function misses some lines
I am trying to write a readline function that requests a fixed number of bytes from ai/o device and buffers the received data and returns a single line. 我正在尝试编写一个readline函数,该函数从ai / o设备请求固定数量的字节,并缓冲接收到的数据并返回一行。
The device does not have it's own readline() method, only a recv(bytes) method and hence my function. 该设备没有它自己的readline()方法,只有一个recv(bytes)方法,因此没有我的功能。
The recv() function is just emulating the i/o device in this case and purely for testing / debugging. 在这种情况下,recv()函数仅模拟I / O设备,纯粹用于测试/调试。
The problem is the ' a ' and ' of ' is missing from the expected output which should be: 问题是预期输出中应该缺少“ a ”和“ of ”:
peter piper picked a peck of pickled peppers
And I can't figure out why. 我不知道为什么。
buff is an array containg complete lines, and xbuff holds partial lines. buff是包含完整行的数组,而xbuff保存部分行。
str = ''
buff = [];
xbuff = b''
data = b"peter\r\npiper\r\npicked\r\na\r\npeck\r\nof\r\npickled\r\npeppers"
def readline():
global buff,xbuff
raw = recv(10)
buff = (xbuff + raw).splitlines()
xbuff = b''
if len(raw) == 10 and not raw.endswith(b'\r\n'):
xbuff = buff.pop()
if len(buff) > 0:
line = buff.pop(0)
return line
return b''
def recv(chrs):
global data
out = data[:chrs]
data = data[chrs:]
return out
while True:
line = readline()
if line:
str += " "+line.decode()
else:
print(str)
break
peter piper picked peck pickled peppers
Oops, need to append to the buffer and not replace it 糟糕,需要附加到缓冲区而不是替换缓冲区
buff += (xbuff + raw).splitlines()
But is this the most pythonic / efficient way of doing this ?? 但这是最pythonic /最有效的方法吗?
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.