py3: misc/dev_tools.py

[jhpalmieri]

The file misc/dev_tools.py has a Python 3 doctest failure:

File "src/sage/misc/dev_tools.py", line 160, in sage.misc.dev_tools.load_submodules
Failed example:
    sage.misc.dev_tools.load_submodules(sage.combinat)
Expected nothing
Got:
    load sage.combinat.designs.orthogonal_arrays_find_recursive...failed

This comes from this block:

        except (ValueError, AttributeError, TypeError, ImportError):
            # we might get error because of cython code that has been
            # compiled but with source removed
            sys.stdout.write("failed\n")

If I add a raise command at the end of this, I see

sage: sage.misc.dev_tools.load_submodules(sage.combinat)
load sage.combinat.algebraic_combinatorics... succeeded
...
load sage.combinat.designs.orthogonal_arrays_find_recursive...failed
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-1-d8b886cdfe68> in <module>()
----> 1 sage.misc.dev_tools.load_submodules(sage.combinat)

/Users/jpalmier/Desktop/Sage/sage_builds/PYTHON3/sage-8.9.beta1/local/lib/python3.7/site-packages/sage/misc/dev_tools.py in load_submodules(module, exclude_pattern)
    198             sys.stdout.flush()
    199             loader = importer.find_module(module_name)
--> 200             loader.load_module(module_name)
    201             sys.stdout.write(" succeeded\n")
    202         except (ValueError, AttributeError, TypeError, ImportError):

/Users/jpalmier/Desktop/Sage/sage_builds/PYTHON3/sage-8.9.beta1/local/lib/python3.7/importlib/_bootstrap_external.py in _check_name_wrapper(self, name, *args, **kwargs)

/Users/jpalmier/Desktop/Sage/sage_builds/PYTHON3/sage-8.9.beta1/local/lib/python3.7/importlib/_bootstrap_external.py in load_module(self, fullname)

/Users/jpalmier/Desktop/Sage/sage_builds/PYTHON3/sage-8.9.beta1/local/lib/python3.7/importlib/_bootstrap_external.py in load_module(self, fullname)

/Users/jpalmier/Desktop/Sage/sage_builds/PYTHON3/sage-8.9.beta1/local/lib/python3.7/importlib/_bootstrap.py in _load_module_shim(self, fullname)

/Users/jpalmier/Desktop/Sage/sage_builds/PYTHON3/sage-8.9.beta1/local/lib/python3.7/importlib/_bootstrap.py in _load(spec)

/Users/jpalmier/Desktop/Sage/sage_builds/PYTHON3/sage-8.9.beta1/local/lib/python3.7/importlib/_bootstrap.py in _load_unlocked(spec)

/Users/jpalmier/Desktop/Sage/sage_builds/PYTHON3/sage-8.9.beta1/local/lib/python3.7/importlib/_bootstrap_external.py in exec_module(self, module)

/Users/jpalmier/Desktop/Sage/sage_builds/PYTHON3/sage-8.9.beta1/local/lib/python3.7/importlib/_bootstrap.py in _call_with_frames_removed(f, *args, **kwds)

/Users/jpalmier/Desktop/Sage/sage_builds/PYTHON3/sage-8.9.beta1/local/lib/python3.7/site-packages/sage/combinat/designs/orthogonal_arrays_find_recursive.pyx in init sage.combinat.designs.orthogonal_arrays_find_recursive (build/cythonized/sage/combinat/designs/orthogonal_arrays_find_recursive.c:13225)()
    798 # Associates to n the list of k,x with x>1 such that there exists an
    799 # OA(k,n+x)-OA(k,x). Useful in find_brouwer_separable_design
--> 800 cdef dict _QDM = sage.combinat.designs.database.QDM
    801 cdef dict ioa_indexed_by_n_minus_x = {}
    802 for x in _QDM.itervalues():

AttributeError: module 'sage.combinat.designs' has no attribute 'database'

I don't know why this fails. A related mystery: in a fresh Sage session:

sage: sage.misc.dev_tools.load_submodules(sage.combinat)
...
sage: sage: sage.combinat.designs.database
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-2-218d9965f21f> in <module>()
----> 1 sage.combinat.designs.database

AttributeError: module 'sage.combinat.designs' has no attribute 'database'
sage: import sage.combinat.designs.database
sage: sage.combinat.designs.database
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-4-218d9965f21f> in <module>()
----> 1 sage.combinat.designs.database

AttributeError: module 'sage.combinat.designs' has no attribute 'database'

whereas if you restart Sage and skip the first line:

sage: sage.combinat.designs.database
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-1-218d9965f21f> in <module>()
----> 1 sage.combinat.designs.database

AttributeError: module 'sage.combinat.designs' has no attribute 'database'
sage: import sage.combinat.designs.database
sage: sage.combinat.designs.database
<module 'sage.combinat.designs.database' from '/Users/jpalmier/Desktop/Sage/sage_builds/PYTHON3/sage-8.9.beta1/local/lib/python3.7/site-packages/sage/combinat/designs/database.py'>

[jhpalmieri]

I don't understand what's going on, but this branch seems to fix the problem.

---

New commits:

​6fc715d

trac 28138: fix py3 doctest in misc/dev_tools.py

[chapoton]

Probably caused by #27916

The fix looks good