Question

当我尝试运行此代码时，出现错误：

line = line + device.readBuffer()
TypeError: can only concatenate list (not "bytes") to list

我搜索了一下，发现对于python 3，在尝试将字节转换为str时需要添加 b“” 。像说的那样更改后，该脚本运行了几秒钟，然后由于给出相同的错误而崩溃。

代码：

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import serial
import re
import datetime

class EM408GPS:
    def __init__(self, serialport, baudratespeed):
        self.gpsdevice = serial.Serial(port=serialport, baudrate=baudratespeed, timeout=5)      
        self.init()
    def init(self):       
        if self.isOpen():
            return True      
        return False
    def open(self):
        self.gpsdevice.open()       
    def isOpen(self):
        print("hey")
        return self.gpsdevice.isOpen()  
    def readBuffer(self):
        try:
            data = self.gpsdevice.read(1)
            n = self.gpsdevice.inWaiting()
            if n:
                data = data + self.gpsdevice.read(n)
            return data

        except Exception as e:
            print("Big time read error, what happened: ", e)
            sys.exit(1)

def main():
    device = EM408GPS("COM9", 9600)
    newdata = b""
    line = b""
    while device.isOpen():
        if newdata: 
            line = newdata
            newdata = b""  

        line = line + device.readBuffer()

        if re.search(b"\r\n", line):
            data = line.split(b"\r\n")
            newdata = line.split(b"\r\n")
            #data, newdata = line.split(b"\r\n")

            print ("----" + str(datetime.datetime.now()) + "----")
            print (data)
            print (newdata)

            line = b""
main()

任何帮助将不胜感激

Answer 1

如果let makeSubfuel =this.state.data.map((subfuel) => { return <Picker.Item label= {subfuel.name} value= {subfuel.id} key= {subfuel.price}/> }) <Form> <Picker style={{ width :'90%' ,borderRadius: 10,borderWidth: 3,borderColor: 'black'}} mode="dropdown" selectedValue={this.state.subfuelid} onValueChange={(value,key,label) => { this.setState({subfuelid: value}) //ToastAndroid.show("models id is "+ value+"price "+price+"label.."+label, ToastAndroid.LONG); } }> <Picker.Item label="Select Fuel Type" value="key0" /> {makeSubfuel} </Picker> </Form>为True，则拆分行，返回type（newdata）= list。然后，您分配re.search(b"\r\n", line)并尝试连接

line = newdata

只能串联列表（不是“字节”）以列出

1 个答案: