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cpython/Lib/importlib/test/source/test_path_hook.py

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Finish properly hiding importlib implementation code.
2009-03-12 19:47:53 -03:00
from importlib import _bootstrap
Rename importlib.test.support to importlib.test.util.
2009-02-01 00:00:05 -04:00
from . import util as source_util
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.
2009-01-17 20:24:28 -04:00
import unittest
class PathHookTest(unittest.TestCase):
"""Test the path hook for source."""
def test_success(self):
Rename importlib.test.support to importlib.test.util.
2009-02-01 00:00:05 -04:00
with source_util.create_modules('dummy') as mapping:
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 18:48:25 -03:00
self.assertTrue(hasattr(_bootstrap._file_path_hook(mapping['.root']),
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.
2009-01-17 20:24:28 -04:00
'find_module'))
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 19:18:47 -03:00
def test_empty_string(self):
# The empty string represents the cwd.
self.assertTrue(hasattr(_bootstrap._file_path_hook(''), 'find_module'))
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.
2009-01-17 20:24:28 -04:00
def test_main():
from test.support import run_unittest
run_unittest(PathHookTest)
if __name__ == '__main__':
test_main()