Re: Question regarding re module

Tomohiro Kusumi

Diez,

Thanks, you're right.
Delegated attributes are not in the dir() result.

>>getattr(reg, "pattern")

'[0-9]+'

>>getattr(reg, "flags")

0

>>getattr(reg, "groupindex")

{}

Tomohiro Kusumi

Tomohiro Kusumi schrieb:

>Hi,

I have a question regarding re module.
# By the way I'm not in this list, so I'm sorry but please CC me.

I tried following code in Python shell using a regular expression.
Why doesn't the result of dir(reg) have 'pattern', 'flags', and
'groupindex' although they exist as members of _sre.SRE_Pattern
instance ?

It sort of irritates me, because whenever I write Python code
using a module which I'm not used to using, I often try Python
shell with TAB complete to find out the member of module/instance.

It could be that the result overloads the __getattr__-method to delegate
calls to some object. Thus it's not part of the outer instance.

Diez

Jun 27 '08 #1

Paul McGuire

On Jun 5, 7:11*am, Tomohiro Kusumi <kusumi.tomoh...@jp.fujitsu.com>
wrote:

>

It could be that the result overloads the __getattr__-method to delegate
calls to some object. Thus it's not part of the outer instance.

Didn't I read that Py3 will support a __dir__ method so that classes
*could* report such pseudo-attributes in response to dir?

-- Paul

Jun 27 '08 #2

Tim Golden

Paul McGuire wrote:

On Jun 5, 7:11 am, Tomohiro Kusumi <kusumi.tomoh...@jp.fujitsu.com>
wrote:

>>It could be that the result overloads the __getattr__-method to delegate
calls to some object. Thus it's not part of the outer instance.

Didn't I read that Py3 will support a __dir__ method so that classes
*could* report such pseudo-attributes in response to dir?

It's already there in 2.6:

.... class X (object):
.... def __init__ (self, a, b):
.... self.a = a
.... self.b = b
.... def __dir__ (self):
.... return ['a', 'b', 'c']
....

>>dir (X (1, 2))

['a', 'b', 'c']

>>>

TJG

Jun 27 '08 #3

Tobiah

It could be that the result overloads the __getattr__-method to delegate
calls to some object. Thus it's not part of the outer instance.

Didn't I read that Py3 will support a __dir__ method so that classes
*could* report such pseudo-attributes in response to dir?

-- Paul

I don't believe that it possibly could:

class foo(object):

def __getattr__(self, what):
if what[0] == 't':
return True

f = foo()

print f.toby
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Jun 27 '08 #4