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python method call

学习ing 2017-06-12 09:23:06

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Part of the code:

#打开串口 ser=serial.Serial('COM3', 9600) #开启一个线程 th=threading.Thread(target=thread_read, args=(ser, msg_parsed)) th.start() def thread_read(ser, callback=None): buf=b' ' while running.is_set(): buf=read_data(ser, buf,callback=None) def read_data(ser, buf, callback=None): if callback is None: callback=print buf += ser.read(ser.inwaiting())

Why do I call inwaiting() in the read_data() method, and an error is reported, telling me that it has no attribute 'inwaiting()'. It is normal to write ser.inwaiting() outside the method. I have not passed the reference of the serial object. Is it in the method? The book master answers!

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Peter_Zhu2017-06-12 09:25:06 2 floor

Don’t pass objects, try using global variables

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大家讲道理2017-06-12 09:25:06 1 floor

print(dir(ser))All methods of printing ser, findinWaitingandin_waiting, there is no inwaiting, so an error is reported.
Are you sure you are calling inwaiting outside?

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