pyj接受串口数据
时间: 2023-10-10 20:11:00 浏览: 48
要接收串口数据,可以使用Python内置的`serial`模块。以下是一个简单的示例代码:
```python
import serial
ser = serial.Serial('/dev/ttyUSB0', 9600) # 串口设备和波特率
while True:
data = ser.readline().decode().strip() # 读取一行数据并转换成字符串
print(data) # 输出数据
```
在上面的代码中,`serial.Serial`函数用来初始化串口对象。第一个参数是串口设备名称,可以使用`/dev/ttyUSB0`等类似的设备路径;第二个参数是波特率,这里设定为9600。
接着,使用一个死循环不断读取串口数据。`ser.readline()`会读取一行数据并返回一个字节串,需要使用`decode()`方法将其转换成字符串。`strip()`方法可以去除字符串两端的空白字符。最后,将读取到的数据输出到控制台。
需要注意的是,如果串口设备已经被其他程序占用,或者权限不足,上面的代码可能会抛出异常。在Linux系统下,可以使用`ls -l /dev/ttyUSB0`等命令查看串口设备的权限和所有者,如果当前用户不是设备的所有者,可以使用`sudo chmod a+rw /dev/ttyUSB0`等命令修改权限。
相关问题
[Errno 22] Invalid argument: 'E:\\pyj\x0ben\\pyz\x03_film.csv'
This error message suggests that there is an issue with the file path specified. The file path contains invalid characters such as '\x0b' and '\x03', which are not recognized by the operating system.
To fix this issue, you can try the following:
1. Check the file path and make sure it is correct.
2. Remove any invalid characters from the file path, such as '\x0b' and '\x03'.
3. Use raw string notation to avoid interpreting escape characters in the file path. For example, instead of 'E:\\pyj\x0ben\\pyz\x03_film.csv', use r'E:\pyj\x0ben\pyz\x03_film.csv'.
4. Ensure that the file exists in the specified location. If not, check the file name and location and correct any errors.
已知包含多个车牌号的字符串:s="AZ7Y90,,B78T11,,HI89Op,K781Ui,AL009H,C88k8P,,nP8291G,m8H88H,DDS822,,QMK782,PYJ212"删除多余的逗号
可以使用字符串的 replace() 方法将多余的逗号替换成空字符串即可。
代码如下:
```python
s = "AZ7Y90,,B78T11,,HI89Op,K781Ui,AL009H,C88k8P,,nP8291G,m8H88H,DDS822,,QMK782,PYJ212"
s = s.replace(",,", ",") # 将多余的逗号替换成单个逗号
if s.startswith(","): # 如果字符串开头是逗号,则去掉
s = s[1:]
if s.endswith(","): # 如果字符串结尾是逗号,则去掉
s = s[:-1]
print(s)
```
输出结果为:
```
AZ7Y90,B78T11,HI89Op,K781Ui,AL009H,C88k8P,nP8291G,m8H88H,DDS822,QMK782,PYJ212
```
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