better way than: myPage += 'more html' , ...

Oren Tirosh oren-py-l at hishome.net
Mon Jun 30 18:01:21 CEST 2003


On Thu, Jun 26, 2003 at 10:30:21AM +1000, Delaney, Timothy C (Timothy) wrote:
> import cStringIO as StringIO
> 
> # Subclass of str so that it can be used nearly anywhere that requires a real
> # string.
> 
> class MutableString (str):
...

Making it a subclass of str doesn't do what you want. Lots of places in the
C code access the string buffer directly (for performance) instead of going 
through the __str__ method. They will all get the value the string had when
it was created rather than its current value. 

There is currently no way to implement a true replacement of the str type in 
Python code. Even an extension type is somewhat limited in its ability to 
emulate a string. 

    Oren





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