Support simple import notation

[wd15]

For example instead of the followoing command, >>> from fipy.viewers.gistViewer.grid1DGistViewer import Grid1DGistViewer one would issue the following command, >>> from fipy import Grid1DGistViewer To do this requires placing the main fipy objects in the fipy __init__ Grid1DGistViewer = fipy.viewers.gistViewer.grid1DGistViewer.Grid1DGistViewer

Imported from trac ticket #32, created by wd15 on 03-10-2005 at 10:17, last modified: 03-17-2005 at 09:25

[guyer]

Logged In: YES user_id=121894 Rather than placing everything in the main fipy/__init__.py, which will be a fragile maintenance nightmare, I think we will want to treat each layer of __init__.py hierarchically. I think the key is to use the __all__ mechanism to define what classes are exported from each level.

Trac comment by jguyer on 03-10-2005 at 10:43

[guyer]

Logged In: YES user_id=121894 Actually, __all__ may not be the correct solution. I think that would require each level of __init__.py to actually import all of its subclasses, which is wasteful (and will break on things like viewers that the user hasn't installed). Probably we will need to define our own import command with __import__()

Trac comment by jguyer on 03-10-2005 at 10:57

[guyer]

Logged In: YES user_id=121894 Abbreviated syntax now supported by way of import hooks in fipy/ __init__.py (c.f. PEP 302 <http://www.python.org/peps/pep-0302.html>). Simple hierarchical search for file name consistent with class name. Can fail in the face of redundancies. Full import syntax is always supported.

Trac comment by jguyer on 03-17-2005 at 09:25