如何在 None 的 Python 列表中设置意外类型

Question

I am trying to put a Port in a list of None's

ports = [None] * 5

for ident in range(len(self.ports)):
     if self.ports[ident] is None:
          try:
              serialC = Serial("COM" + str(ident), 19200)
              portX = Port(serialC, ident, self.main)
              #portX.start()
              self.ports[ident] = portX
          except Exception as e:
              print(e)
              continue

But I get an Unexpected type(s) (int, Port) Expected (int, None) (slice, itarable[None])

With error message: Can't set attribute.

How do I fix this error?.

class Port(threading.Thread):
    def __init__(self, port, ident, main):
        self.main = main
        self.port = port
        self.ident = ident
        threading.Thread.__init__(self)

Traceback (most recent call last):
  File "C:\Users\TDJ-PC\PycharmProjects\embeddedProject\serialTh.py", line 28, in check
    portX = Port(Serial("Com" + str(ident), 19200), ident, self.main)
  File "C:\Users\TDJ-PC\PycharmProjects\embeddedProject\port.py", line 10, in __init__
    self.ident = ident
AttributeError: can't set attribute

Answer 1

The ident property of a Thread object is not assignable; you cannot set it from the __init__ method of your subclass, and it doesn't make sense to do so.

From the documentation :

The 'thread identifier' of this thread or None if the thread has not been started. This is a nonzero integer. See the get_ident() function. Thread identifiers may be recycled when a thread exits and another thread is created. The identifier is available even after the thread has exited.

So, the ident property will be set for you automatically when you start the thread.