Commit Graph

12 Commits

Author SHA1 Message Date
Brett Cannon d71bed3d76 Make importlib.abc.SourceLoader the primary mechanism for importlib.
This required moving the class from importlib/abc.py into
importlib/_bootstrap.py and jiggering some code to work better with the class.
This included changing how the file finder worked to better meet import
semantics. This also led to fixing importlib to handle the empty string from
sys.path as import currently does (and making me wish we didn't support that
instead just required people to insert '.' instead to represent cwd).

It also required making the new set_data abstractmethod create
any needed subdirectories implicitly thanks to __pycache__ (it was either this
or grow the SourceLoader ABC to gain an 'exists' method and either a mkdir
method or have set_data with no data arg mean to create a directory).

Lastly, as an optimization the file loaders cache the file path where the
finder found something to use for loading (this is thanks to having a
sourceless loader separate from the source loader to simplify the code and
cut out stat calls).
Unfortunately test_runpy assumed a loader would always work for a module, even
if you changed from underneath it what it was expected to work with. By simply
dropping the previous loader in test_runpy so the proper loader can be returned
by the finder fixed the failure.

At this point importlib deviates from import on two points:

1. The exception raised when trying to import a file is different (import does
an explicit file check to print a special message, importlib just says the path
cannot be imported as if it was just some module name).

2. the co_filename on a code object is not being set to where bytecode was
actually loaded from instead of where the marshalled code object originally
came from (a solution for this has already been agreed upon on python-dev but has
not been implemented yet; issue8611).
2010-07-03 22:18:47 +00:00
Brett Cannon 61b14251d3 Make importlib.abc.SourceLoader the primary mechanism for importlib.
This required moving the class from importlib/abc.py into
importlib/_bootstrap.py and jiggering some code to work better with the class.
This included changing how the file finder worked to better meet import
semantics. This also led to fixing importlib to handle the empty string from
sys.path as import currently does (and making me wish we didn't support that
instead just required people to insert '.' instead to represent cwd).

It also required making the new set_data abstractmethod create
any needed subdirectories implicitly thanks to __pycache__ (it was either this
or grow the SourceLoader ABC to gain an 'exists' method and either a mkdir
method or have set_data with no data arg mean to create a directory).

Lastly, as an optimization the file loaders cache the file path where the
finder found something to use for loading (this is thanks to having a
sourceless loader separate from the source loader to simplify the code and
cut out stat calls).
Unfortunately test_runpy assumed a loader would always work for a module, even
if you changed from underneath it what it was expected to work with. By simply
dropping the previous loader in test_runpy so the proper loader can be returned
by the finder fixed the failure.

At this point importlib deviates from import on two points:

1. The exception raised when trying to import a file is different (import does
an explicit file check to print a special message, importlib just says the path
cannot be imported as if it was just some module name).

2. the co_filename on a code object is not being set to where bytecode was
actually loaded from instead of where the marshalled code object originally
came from (a solution for this has already been agreed upon on python-dev but has
not been implemented yet; issue8611).
2010-07-03 21:48:25 +00:00
Barry Warsaw 28a691b7fd PEP 3147 2010-04-17 00:19:56 +00:00
Brett Cannon 2153dc001f Move over to using assertRaises as a context manager for importlib tests.
Obviously one shouldn't do whole sale conversions like this, but I was already
going through the test code and I was bored at the airport.
2009-08-27 23:49:21 +00:00
Benjamin Peterson c9c0f201fe convert old fail* assertions to assert* 2009-06-30 23:06:06 +00:00
Brett Cannon f87e04d339 Finish properly hiding importlib implementation code. 2009-03-12 22:47:53 +00:00
Brett Cannon 4afab6b30b Separate out finder for source and source/bytecode. 2009-02-21 03:31:35 +00:00
Brett Cannon 2dee597e05 Do some cleanup in importlib:
+ Ditch using arguments to super().
+ Ditch subclassing from object directly.
+ Move directory check out of chaining path hook to file path hook/finder.
+ Rename some classes to better reflect they are finders, not importers.
2009-02-21 03:15:37 +00:00
Brett Cannon bcb26c53c0 Rename importlib.test.support to importlib.test.util. 2009-02-01 04:00:05 +00:00
Brett Cannon 4ee2cdaf65 Split out support code that is specific to source tests out of
importlib.test.support to importlib.test.source.util.
2009-02-01 03:08:31 +00:00
Brett Cannon f254a75176 Merge testing ABCs for importlib into importlib.test.abc. 2009-01-30 00:22:35 +00:00
Brett Cannon 23cbd8a656 Add initial implementation of importlib. See the NOTES files for what is
planned for the package.

There are no docs yet, but they are coming once the API for the first new
function, importlib.import_module() is finalized.
2009-01-18 00:24:28 +00:00