* Robert P. J. Day:
On Sun, 24 Jan 2010, Alf P. Steinbach wrote:
* Robert P. J. Day:
once again, probably a trivial question but i googled and didn't
get an obvious solution. how to list the attributes of a *class*?
eg., i was playing with dicts and noticed that the type returned by
the keys() method was "dict_keys". so i'm now curious as to the
attributes of the dict_keys class. but i don't know how to look at
that without first *creating* such an instance, then asking for
"dir(dk)".
Like,
dir( list )
where 'list' is the built-in type.
There's a pretty-printer for that somewhere, but I can't recall.
except that doesn't work for
>>> dir(dict_keys)
so what's the difference there?
'list' is a built-in type that by default is available.
'dict_keys' is a type that you're not meant to use directly, so it's not made
available by default.
The 'type' function yields the type of its argument, so you *can* do e.g.
DictKeys = type( {}.keys() )
dir( DictKeys )
list( vars( DictKeys ) )
help( DictKeys )
It doesn't help much though because the only method of interrest is __iter__,
which produces an iterator that you can use e.g. in a for loop or to construct a
list, whatever.
The relevant place to find out more about keys() is in the documentation.
Cheers & hth.,
- Alf
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