[英]functools.partial as IronPython EventHandler
I'm currently trying out the IronPython
interpreter. 我正在尝试使用IronPython
解释器。 While doing the Tutorial i came across delegates and event handlers. 在做教程时,遇到了代理和事件处理程序。 The tutorial does something like this: 教程做了这样的事情:
from System.IO import FileSystemWatcher
w = FileSystemWatcher()
def handle(*args):
print args
w.Changed += handle
So i tried to be smart and do this: 所以我试图聪明并做到这一点:
from System.IO import FileSystemWatcher
from __future__ import print_function
from functools import partial
w = FileSystemWatcher()
w.Changed += partial(print, "Changed: ")
Which failed with: 哪个失败了:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: Object is not callable.
Where line 1
refers to the last line in the (interactive session) line 1
是指(交互式会话)中的最后一行
So IronPython thinks a partial
object is not callable although callable(partial(print, "Changed: "))
returns True
所以IronPython认为partial
对象不可调用,尽管callable(partial(print, "Changed: "))
返回True
With this workaround the handler is accepted: 通过此解决方法,接受处理程序:
w.Changed += partial(print, "Changed: ").__call__
My question: 我的问题:
Why is a partial
object not accepted as an event handler. 为什么不接受partial
对象作为事件处理程序。 Is this a bug? 这是一个错误吗?
This is probably not solution, one could expect, but there is an issue, opened for couple years now - https://github.com/IronLanguages/main/issues/808 这可能不是解决方案,人们可以预期,但是有一个问题,现在开了几年 - https://github.com/IronLanguages/main/issues/808
Doesn't work in 2.6.2 and 2.7b1 on .NET Version: 4.0.30319.1 ipy26 testcase-26482.py 在.NET版本的2.6.2和2.7b1中不起作用:4.0.30319.1 ipy26 testcase-26482.py
Object is not callable. 对象不可调用。
ipy27 testcase-26482.py ipy27 testcase-26482.py
Object is not callable.py 对象不是callable.py
testcase-26482.py testcase-26482.py
Object is not callable. 对象不可调用。
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