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This example tests the %import directive and python import from __init__.py.
This case is not correctly handled by swig 2.
The issue was reported as Source Forge bug #1297 and later as GitHub issue #7.
Use 'python runme.py' to run a test.
Overview:
---------
The example defines 2 different extension modules--each wrapping a separate C++
class.
pyX/pkg2/pkg3/pkg4/foo.i - Pkg4_Foo class
pyX/pkg2/bar.i - Pkg2_Bar class derived from Pkg4_Foo
and the package pyX.pkg2 has:
pyX/pkg2/__init__.py - which imports something from "bar" module
For example with python 2.x the py2/pkg2/__init__.py imports Pkg2_Bar class as
follows
from bar import Pkg2_Bar # [1]
Such cases doesn't work when fully qualified python module names are used by
swig to generate python import directives (SF bug 1297). The generated file
"py2/pkg2/bar.py" has following lines:
import py2.pkg2.pkg3.pkg4.foo # [2]
class Pkg2_Bar(py2.pkg2.pkg3.pkg4.foo.P1_S1_S2_Foo): # [3]
and it's not possible to import anything from py2.pkg2 subpackage, e.g.
import py2.pkg2
fails with the following exception:
Traceback (most recent call last):
File "runme.py", line 3, in <module>
import py2.pkg2
File "py2/pkg2/__init__.py", line 4, in <module>
from bar import Pkg2_Bar
File "py2/pkg2/bar.py", line 71, in <module>
class Pkg2_Bar(py2.pkg2.pkg3.pkg4.foo.Pkg4_Foo):
AttributeError: 'module' object has no attribute 'pkg2'
It seems like during the import [1], the subpackage pkg2 is not yet fully
initialized, so py2.pkg2 can't be used. The above exception is raised at
line [3]. The problem disappears, for example, if we force swig to use relative
package names.
The difference between this ('from_init3') case and the case
'from_init2' is that here we import base class from module
pyX.pkg2.pkg3.pkg4.foo, which is nested deeper than it was in
'from_init2'. This is just to ensure, that two (and more) levels of
subpackages get imported correctly by generated python code, i.e, not only
'pkg3.foo' is handled properly (one-level subpackage) but the code works also
for 'pkg3.pkg4.foo', and so on.
If everything works well, the package pyX.pkg2 shall load properly.
Unix:
-----
- Run make
- Run the test as described above
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