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The Python module import logic has changed to stop obfuscating real ImportError problems.

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Only one import of the low-level C/C++ module from the pure Python module is
attempted now. Previously a second import of the low-level C/C++ module was attempted
after an ImportError occurred and was done to support 'split modules'. A 'split module' is
a configuration where the pure Python module is a module within a Python package and the
low-level C/C++ module is a global Python module. Now a 'split module' configuration is
no longer supported by default. This configuration can be supported with a simple
customization, such as:

  %module(package="mypackage", moduleimport="import $module") foo

or if using -builtin:

  %module(package="mypackage", moduleimport="from $module import *") foo

instead of

  %module(package="mypackage") foo

See the updated Python chapter titled "Location of modules" in the documentation.

Closes #848 #1343
This commit is contained in:
William S Fulton 2018-12-16 16:34:04 +00:00
commit 03323f5c8b
6 changed files with 275 additions and 126 deletions
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7
Doc/Manual/Contents.html
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@ -1690,12 +1690,13 @@
<li><a href="Python.html#Python_absrelimports">Absolute and relative imports</a>
<li><a href="Python.html#Python_absimport">Enforcing absolute import semantics</a>
<li><a href="Python.html#Python_importfrominit">Importing from __init__.py</a>
<li><a href="Python.html#Python_implicit_namespace_packages">Implicit Namespace Packages</a>
<li><a href="Python.html#Python_package_search">Searching for the wrapper module</a>
<li><a href="Python.html#Python_implicit_namespace_packages">Implicit namespace packages</a>
<li><a href="Python.html#Python_package_search">Location of modules</a>
<ul>
<li><a href="Python.html#Python_package_search_both_package_modules">Both modules in the same package</a>
<li><a href="Python.html#Python_package_search_wrapper_split">Split modules</a>
<li><a href="Python.html#Python_package_search_both_global_modules">Both modules are global</a>
<li><a href="Python.html#Python_package_search_wrapper_split">Split modules custom configuration</a>
<li><a href="Python.html#Python_custom_module_import">More on customizing the module import code</a>
<li><a href="Python.html#Python_package_search_static">Statically linked C modules</a>
</ul>
</ul>