Comment #4 on issue 543 by vlada.pe...@gmail.com: warnings on python
setup.py build
http://code.google.com/p/sympy/issues/detail?id=543
Yes, you can have empty __init__ files, even the documentation says so.
From [1]:
"The __init__.py files are required to make Python treat the directories as
containing packages; this is done to prevent directories with a common
name, such as string, from unintentionally hiding valid modules that occur
later on the module search path. In the simplest case, __init__.py can just
be an empty file, but it can also execute initialization code for the
package or set the __all__ variable, described later."
[1] http://docs.python.org/tutorial/modules.html
So yeah, they're harmless, but you can silence the warnings (and perhaps
prevent some future issues) by adding empty __init__.py files.
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