Re: Trouble with a certain Exception

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Trouble with a certain Exception

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Join Date: Jul 2006

Posts: 554

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Re: Trouble with a certain Exception

#6

May 8th, 2008

And I have no knowledge at all of the Voice Recognition module... :lol:

This error is saying something interesting:

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class ContextEvents(win32com.client.getevents("SAPI.SpSharedRecoContext")):
TypeError: Error when calling the metaclass bases
cannot create 'NoneType' instances

Apparently, it is defining a class that inherits from the result of the call to

win32com.client.getevents("SAPI.SpSharedRecoContext")

I've not heard of dynamic inheritance before, but it makes sense that Python could do it!

I was able to reproduce the bug like this:

 Help with Code Tags 
 Python Syntax (Toggle Plain Text) 
class MyClass(eval(raw_input("Enter a Class: "))):
    pass
>>> Enter a Class: object
>>> m = MyClass()
>>> print m
<__main__.MyClass object at 0x00BFB250>
 
---
 
>>> 
Enter a Class: str
>>> m = MyClass()
>>> print m
 
>>> m
''
>>> 
 
---
 
>>> Enter a Class: None
>>> m = MyClass()
Traceback (most recent call last):
  File "C:/Python25/dyninherit.py", line 1, in <module>
    class MyClass(eval(raw_input("Enter a Class"))):
TypeError: Error when calling the metaclass bases
    cannot create 'NoneType' instances 
class MyClass(eval(raw_input("Enter a Class: "))):
    pass
>>> Enter a Class: object
>>> m = MyClass()
>>> print m
<__main__.MyClass object at 0x00BFB250>

---

>>> 
Enter a Class: str
>>> m = MyClass()
>>> print m

>>> m
''
>>> 

---

>>> Enter a Class: None
>>> m = MyClass()
Traceback (most recent call last):
  File "C:/Python25/dyninherit.py", line 1, in <module>
    class MyClass(eval(raw_input("Enter a Class"))):
TypeError: Error when calling the metaclass bases
    cannot create 'NoneType' instances 

So apparently, win32com.client.getevents("SAPI.SpSharedRecoContext") is returning None when it ought to return some class name.

Can you find anything out about that?

Jeff

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