python theading.Timer：如何将参数传递给回调？
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python theading.Timer: how to pass argument to the callback?
提问by Bin Chen
My code:
我的代码：
import threading
def hello(arg, kargs):
print arg
t = threading.Timer(2, hello, "bb")
t.start()
while 1:
pass
The print out put is just:
打印出来的只是：
b
How can I pass a argument to the callback? What does the kargs mean?
如何将参数传递给回调？kargs 是什么意思？
采纳答案by Glenn Maynard
Timertakes an array of arguments and a dict of keyword arguments, so you need to pass an array:
Timer需要一个参数数组和一个关键字参数字典，所以你需要传递一个数组：
import threading
def hello(arg):
print arg
t = threading.Timer(2, hello, ["bb"])
t.start()
while 1:
pass
You're seeing "b" because you're not giving it an array, so it treats "bb"an an iterable; it's essentially as if you gave it ["b", "b"].
你看到“b”是因为你没有给它一个数组，所以它对待"bb"一个可迭代的；它本质上就好像你给了它一样["b", "b"]。
kwargsis for keyword arguments, eg:
kwargs用于关键字参数，例如：
t = threading.Timer(2, hello, ["bb"], {arg: 1})
See http://docs.python.org/release/1.5.1p1/tut/keywordArgs.htmlfor information about keyword arguments.
有关关键字参数的信息，请参阅http://docs.python.org/release/1.5.1p1/tut/keywordArgs.html。
回答by outis
The third argument to Timeris a sequence. Since you pass "bb" as that sequence, hellogets the elements of that sequence ("b" and "b") as separate arguments (argand kargs). Put "bb" in a list and hellowill get the string as the first argument.
的第三个参数Timer是一个序列。由于您将“bb”作为该序列传递，因此将该序列hello的元素（“b”和“b”）作为单独的参数（arg和kargs）获取。将“bb”放入列表中，hello并将获得字符串作为第一个参数。
t = threading.Timer(2, hello, ["bb"])
As for hello's parameters, you probably mean:
至于hello的参数，您可能的意思是：
def hello(*args, **kwargs):
The meaning of **kwargsis covered in the queston "What does *args and **kwargs mean?"
的含义**kwargs包含在问题“ *args 和 **kwargs 是什么意思？”
