python线程theading.Thread

Thread类构造器详解

原创于 2023-01-31 15:24:42 发布 · 182 阅读

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本文详细解析了Thread类构造器的各个参数及其作用，重点介绍了target参数和daemon参数的使用方式及含义。target参数通常是一个待执行的函数，而daemon参数用于设定线程是否为守护线程。

Thread 类构造器参数及说明：

    def __init__(self, group=None, target=None, name=None,
                 args=(), kwargs=None, *, daemon=None):
        """This constructor should always be called with keyword arguments. Arguments are:

        *group* should be None; reserved for future extension when a ThreadGroup
        class is implemented.

        *target* is the callable object to be invoked by the run()
        method. Defaults to None, meaning nothing is called.

        *name* is the thread name. By default, a unique name is constructed of
        the form "Thread-N" where N is a small decimal number.

        *args* is the argument tuple for the target invocation. Defaults to ().

        *kwargs* is a dictionary of keyword arguments for the target
        invocation. Defaults to {}.

        If a subclass overrides the constructor, it must make sure to invoke
        the base class constructor (Thread.__init__()) before doing anything
        else to the thread.

        """

        assert group is None, "group argument must be None for now"
        if kwargs is None:
            kwargs = {}
        self._target = target
        self._name = str(name or _newname())
        self._args = args
        self._kwargs = kwargs
        if daemon is not None:
            self._daemonic = daemon
        else:
            self._daemonic = current_thread().daemon

其中比较关键的两个参数：
target一般是一个函数；
daemon 指定所创建的线程是否为后代线程。如果没有指定则继承父线程的这个属性。

daemon是守护的意思,当daemon赋值为True时,进程不会等到线程的结束,进程一结束,线程也会结束;当daemon赋值为False时,进程会等线程执行结束再退出。打个比方,daemon为False,就相当于领导等员工活干完了,才下班;daemon为True,就相当于领导一走,员工也马上撤了,如果不设置,默认领导是会等员工再走的。
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