Subclassing RegexObject

[Tobias Weber]

Hi,
how do I subclass or at least add a method to something returned by
re.compile()?

 

[Peter Otten]

how do I subclass or at least add a method to something returned by
re.compile()?

Let's see:
....
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: Error when calling the metaclass bases
type '_sre.SRE_Pattern' is not an acceptable base type

So I'm afraid you can't subclass...
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: can't set attributes of built-in/extension type
'_sre.SRE_Pattern'Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: '_sre.SRE_Pattern' object has no attribute 'hello'

....nor add a method...
.... def __init__(self, match):
.... self._match = match
.... def __getattr__(self, name):
.... return getattr(self._match, name)
.... hello = hello
........ m = original_compile(*args, **kw)
.... if m is not None:
.... return W(m)
....hello

....but alter the meaning of "something returned by re.compile()" you can.
Now who would want to do that? And why?

Peter

 

[Tobias Weber]

[/QUOTE]

Thanks for showing the introspection way!

type '_sre.SRE_Pattern' is not an acceptable base type

And again the Python documentation only writes about how things would be
if they were actually implemented in Python...

Now who would want to do that? And why?

My class only really needs one attribute, which is a regular expression,
so I thought to save a line or two by subclassing that