[Python-Dev] Re: Draft: PEP for imports (original) (raw)

Paul Moore pf_moore at yahoo.co.uk
Mon Feb 2 14:06:14 EST 2004

Chris Reedy <chrisandannreedy at comcast.net> writes:

Thinking about the semantics of the above, including corner cases, I find myself wanting to make the semantics of:

in "" to be equivalent to: sys.path.insert(0, "") del sys.path[0] # assuming the import doesn't modify sys.path

This seems to me to be another example of the sort of setup/teardown idiom that PEP 310 was designed for:

with path_entry("<path">):
    import whatever

Here, we have

class path_entry
    def __init(self, path):
        self.path = path
    def __enter__(self):
        sys.path.insert(0, path)
    def __exit__(self):
        del sys.path[0]

... and of course, path_entry might be a suitable candidate for some sort of standard library module of useful "with" idioms.

Hmm, maybe it's time to look at PEP 310 again.

Paul

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