Re: [Python-Dev] how GNU stow is complementary rather than alternative to distutils
Talking of stow, I take advantage of this thread to do some shameless advertising :) Recently I uploaded to PyPI a software of mine, BPT [1], which does the same symlinking trick of stow, but it is written in Python (and with a simple api) and, more importantly, it allows with another trick the relocation of the installation directory (it creates a semi- isolated environment, similar to virtualenv). I find it very convenient when I have to switch between several versions of the same packages (for example during development), or I have to deploy on the same machine software that needs different versions of the dependencies. I am planning to write an integration layer with buildout and easy_install. It should be very easy, since BPT can handle directly tarballs (and directories, in trunk) which contain a setup.py. HTH, Giuseppe [1] http://pypi.python.org/pypi/bpt P.S. I was not aware of stow, I'll add it to the references and see if there are any features that I can steal ___ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
Re: [Python-Dev] What if replacing items in a dictionary returns the new dictionary?
On Fri, Apr 29, 2011 at 4:05 PM, Roy Hyunjin Han
wrote:
>> You can implement this in your own subclass of dict, no?
>
> Yes, I just thought it would be convenient to have in the language
> itself, but the responses to my post seem to indicate that [not
> returning the updated object] is an intended language feature for
> mutable types like dict or list.
In general nothing stops you to use a proxy object that returns itself
after each method call, something like
class using(object):
def __init__(self, obj):
self._wrappee = obj
def unwrap(self):
return self._wrappee
def __getattr__(self, attr):
def wrapper(*args, **kwargs):
getattr(self._wrappee, attr)(*args, **kwargs)
return self
return wrapper
d = dict()
print using(d).update(dict(a=1)).update(dict(b=2)).unwrap()
# prints {'a': 1, 'b': 2}
l = list()
print using(l).append(1).append(2).unwrap()
# prints [1, 2]
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