Want to inherit from file

[Steve Holden]

Franz GEIGER wrote:
> 
> I'd like to inherit from file to add some functionality:
> 
[snip]
>  As a file object comes into existence by calling f=open() and not something
> like f=File(), I guess there is no regular way to do it.
> 
> Any idea how to overcome this?
> 
> Best regards
> Franz GEIGER

Correct.  One of the less-pure aspects of Python is that the built-in
types are not first-class objects such as you build when defining your
own classes, and cannot be used as superclasses.

However, it's quite easy to build a wrapper class, offering pretty much
the same functionality.  Take a look at the UserList and UserDict library
modules for clues as to how.

regards
 Steve
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